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Solidity is a programming language used to write smart contracts on the Ethereum blockchain


Solidity Documentation
Release 0.8.29 

 Solidity for beginners - Part 1 | Introduction - YouTube  

Solidity is a powerful language for Ethereum smart contracts, and it enables the creation of decentralized applications (DApps). Here are some of the top Solidity topics used worldwide for blockchain development:

Solidity Ethereum Blockchain Smart contract Computer programming, Solidity, angle, triangle, logo png | PNGWing  

Entry-Level Positions (0–2 Years of Experience):

  • Junior Blockchain Developers, including those specializing in Solidity, typically earn between ₹5–8 lakh per annum (LPA).
    upgrad.com

Mid-Level Positions (3–6 Years of Experience):

  • Developers with hands-on experience in smart contract development can expect salaries ranging from ₹12–18 LPA.
    upgrad.com

Senior-Level Positions (7+ Years of Experience):

  • Senior professionals, such as Blockchain Architects or Leads, often command salaries of ₹25 LPA or more.
    upgrad.com

Additional Insights:

  • The average salary for a Blockchain Developer in India is approximately $57,936 per year.
    cryptojobslist.com
  • Remote Solidity developers have an average salary of $122,500, which is 26.1% higher than the average remote startup salary.
    wellfound.com

 

1. Smart Contract Basics

  • Solidity Syntax, Data Types, and Functions
  • Gas Fees and Optimizations
  • Contract Deployment (Remix, Hardhat, Foundry)
  • Event Logging (emit and event)

2. Smart Contract Security

  • Reentrancy Attacks (DAO Hack Prevention)
  • Integer Overflow & Underflow (SafeMath & Solidity 0.8+)
  • Front-Running Attacks (Using Commit-Reveal Patterns)
  • Denial of Service (DoS)
  • Self-Destruct and Suicide Attacks
  • Access Control Mechanisms (Ownable, RBAC)
  • Flash Loan Exploits (DeFi Risk Management)

3. DeFi (Decentralized Finance) Contracts

  • ERC-20 Token Contracts (Standard Tokens)
  • Liquidity Pools (Uniswap, PancakeSwap)
  • Staking Contracts (Yield Farming, Auto-Compounding)
  • Flash Loan Smart Contracts (Aave, DyDx)
  • Decentralized Exchanges (DEXs)
  • Stablecoins (DAI, USDT Mechanisms)
  • Lending and Borrowing Platforms (Compound, Aave)

4. NFTs & Gaming (ERC-721, ERC-1155)

  • NFT Minting Contracts (Lazy Minting, Batch Minting)
  • NFT Marketplaces (OpenSea, Blur)
  • On-Chain & Off-Chain Metadata Storage (IPFS, Arweave)
  • Play-to-Earn (P2E) Smart Contracts
  • Royalty Mechanisms for Creators
  • Soulbound Tokens (Non-Transferable NFTs)

5. DAOs (Decentralized Autonomous Organizations)

  • Voting Mechanisms (Quadratic Voting, Snapshot)
  • Governance Tokens (ERC-20 DAO Voting)
  • Treasury Management in DAOs
  • Delegation & Staking Mechanisms
  • Multi-Signature Wallets (Gnosis Safe)

6. Oracles & Real-World Data Integration

  • Chainlink VRF (Verifiable Randomness for Lotteries & Games)
  • Decentralized Oracle Networks (Chainlink, Band, API3)
  • Price Feeds for DeFi (ETH/USD, BTC/USD)
  • Weather and Sports Data on Blockchain

7. Layer 2 & Scaling Solutions

  • Optimistic Rollups (Optimism, Arbitrum)
  • ZK-Rollups (zkSync, StarkNet)
  • Plasma & Sidechains (Polygon, BSC)
  • State Channels (Raiden Network)
  • Interoperability (Bridges between Ethereum & Other Chains)

8. Privacy & Zero-Knowledge Proofs (ZKPs)

  • zk-SNARKs & zk-STARKs (Zcash, Tornado Cash)
  • Confidential Transactions on Ethereum
  • Private Smart Contracts (Aztec, Secret Network)
  • Mixer Contracts for Anonymity (Tornado Cash, Railgun)

9. MEV (Miner Extractable Value) & Trading Bots

  • MEV Bots & Arbitrage on Ethereum
  • Sandwich Attacks & MEV Protection
  • Flashbots & Private Transactions
  • Front-Running Prevention Techniques

10. Cross-Chain Smart Contracts

  • Ethereum to Binance Smart Chain (BSC) Bridges
  • LayerZero & Axelar Cross-Chain Messaging
  • Cosmos IBC (Inter-Blockchain Communication)
  • Polkadot Parachains and Cross-Chain dApps

11. Tokenomics & Advanced Token Standards

  • ERC-777 (Advanced ERC-20)
  • ERC-4626 (Yield-Bearing Vaults)
  • Token Vesting & Locking Mechanisms
  • Deflationary & Burn Mechanisms (BNB, SHIB)
  • Reflection Tokens (SAFEMOON, RFI)

12. AI & Blockchain Integration

  • Decentralized AI Networks (Fetch.ai, Ocean Protocol)
  • AI-Driven Smart Contracts
  • Machine Learning Models on Ethereum

 

Ethereum - Feb 21, 2025

✅ Step 1: Solidity + Smart Contracts Mastery (March) 



Step 1: Solidity + Smart Contracts Mastery (March)

  • Ethereum & EVM ka Deep Understanding
  • Solidity ke Advanced Concepts: Mappings, Modifiers, Events
  • Gas Optimization, Upgradable Contracts, Security Best Practices
  • ERC-20, ERC-721, ERC-1155 Standards Deep Dive
  • Hardhat & Remix IDE Se Smart Contract Development

🛠 Projects (GitHub Pe Upload Karna) 1️⃣ ERC-20 Token (Apni Cryptocurrency Launch Karo)
2️⃣ NFT Smart Contract (Lazy Minting Feature ke saath)
3️⃣ Crowdfunding DApp (Blockchain pe Fund Raising Platform)

📚 Best Resources:
🔹 Solidity By Example
🔹 CryptoZombies Solidity Course
🔹 Ethereum Smart Contract Security


https://www.blockchain-council.org/blockchain/mainnet-vs-testnet/

https://blockexplorer.one/ethereum/rinkeby

https://www.alchemy.com/overviews/rinkeby-testnet

https://github.com/crytic/evm-opcodes?tab=readme-ov-file#table

 






 

Metamask installations

How to Install and Set Up MetaMask (Perfect Guide)

MetaMask is a crypto wallet and gateway to blockchain apps (DApps). It allows you to interact with Ethereum, Binance Smart Chain (BSC), Polygon, and other networks.

🔹 Step 1: Install MetaMask

On Browser (Chrome, Firefox, Edge, Brave)

  1. Open the official MetaMask website:
    👉 https://metamask.io/
  2. Click "Download" and choose your browser.
  3. Click "Add to Chrome" (or your browser).
  4. Click "Add Extension".
  5. After installation, click the 🦊 MetaMask icon in the browser toolbar.

On Mobile (Android & iOS)

  1. Open Google Play Store (Android) or Apple App Store (iOS).
  2. Search for MetaMask.
  3. Tap Install and open the app.
  4. Follow the setup instructions.

🔹 Step 2: Create a MetaMask Wallet

  1. Open MetaMask and click "Get Started".
  2. Select "Create a Wallet".
  3. Set a strong password (Use a mix of numbers, letters & symbols).
  4. Click "Create".

🔹 Step 3: Secure Your Wallet (Secret Recovery Phrase)

  1. MetaMask gives you a 12-word Secret Recovery Phrase.
    • ⚠ IMPORTANT: This phrase is the ONLY way to recover your wallet.
    • DO NOT share it with anyone.
    • DO NOT store it online or take screenshots.
    • Write it on paper and keep it safe.
  2. Click "Next" and confirm your phrase by selecting the words in order.
  3. Click "Confirm" → Your wallet is ready! 🎉

🔹 Step 4: Add Networks (Ethereum, BSC, Polygon, etc.)

To Add a Network Manually:

  1. Click 🦊 MetaMask Icon → Go to Settings → Networks.
  2. Click "Add Network" and enter the details:

✅ Ethereum Mainnet (Default)

  • Name: Ethereum Mainnet
  • RPC URL: https://mainnet.infura.io/v3/YOUR_INFURA_PROJECT_ID
  • Chain ID: 1
  • Symbol: ETH
  • Explorer: https://etherscan.io/

✅ Binance Smart Chain (BSC)

  • Name: Binance Smart Chain
  • RPC URL: https://bsc-dataseed.binance.org/
  • Chain ID: 56
  • Symbol: BNB
  • Explorer: https://bscscan.com/

✅ Polygon (MATIC)

  • Name: Polygon Mainnet
  • RPC URL: https://polygon-rpc.com/
  • Chain ID: 137
  • Symbol: MATIC
  • Explorer: https://polygonscan.com/
  1. Click "Save" and select the network from MetaMask.

🔹 Step 5: Add Funds (ETH, BNB, MATIC, etc.)

Buy Crypto on MetaMask

  • Open MetaMask → Click "Buy" → Choose a payment method.

Transfer Crypto from an Exchange

  1. Copy Your Wallet Address
    • Open MetaMask → Click "Account" → Copy your wallet address.
  2. Go to Binance, Coinbase, KuCoin, etc.
    • Select Withdraw → Choose ETH, BNB, or MATIC.
  3. Paste Your MetaMask Address.
  4. Select the correct network (Ethereum, BSC, or Polygon).
  5. Click Withdraw → Confirm.

🔹 Step 6: Connect MetaMask to DApps

  • Open any Web3 DApp (e.g., Uniswap, OpenSea, PancakeSwap, etc.).
  • Click "Connect Wallet" → Select MetaMask.
  • Approve the connection.

🎯 MetaMask is Ready! Now you can use it for:

✅ Storing ETH, BNB, MATIC, USDT, etc.
✅ Connecting to Web3 DApps like Uniswap, OpenSea, and PancakeSwap
✅ Sending and receiving cryptocurrency
✅ Swapping tokens inside MetaMask 


=====================================================================

 

===========================================================================





 

 

 

 

2 types  - fixed size array , dynamic size array 



contract Array
{
    uint[4] public  arr=[0,2,3,6];
    function setter (uint index,uint value) public
    {
        arr[index]=value;
    }
    function length() public view returns(uint){
        return arr.length;
    }
}   

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;

contract array
{
    uint[] public arr;
    function pushElement(uint item) public
{
    arr.push(item);
}
}
 
 
 
 
 

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;

contract array
{
    uint[] public arr;
    function pushElement(uint item) public
{
    arr.push(item);
}
function len() public view returns (uint256)
 { return arr.length;}
 function popElement() public {
    arr.pop();
 }
}
 
 
contract Array
{
    bytes3 public b3;
    bytes2 public b2;
function setter() public
{
    b3='abc';
    b2='ab';
}

} 
 
 
  
Dynamic size array  
 
// SPDX-License-Identifier: MIT
pragma solidity >=0.8.4 <0.9.0;

struct student {
    uint roll;
    string name;
    string addresss;
    string phone_number;
}

contract Demo {
    student public s1;

    // Constructor to initialize the student struct
    constructor(uint _roll, string memory _name, string memory _addresss, string memory _phone_number) {
        s1.roll = _roll;
        s1.name = _name;
        s1.addresss = _addresss;
        s1.phone_number = _phone_number;
    }

    // Function to change the student's details
    function change(uint _roll, string memory _name, string memory _addresss, string memory _phone_number) public {
        // Creating a new student object with updated values
        student memory new_student = student({
            roll: _roll,
            name: _name,
            addresss: _addresss,
            phone_number: _phone_number
        });

        // Updating the public student struct 's1'
        s1 = new_student;
    }
}







// SPDX-License-Identifier: MIT
pragma solidity ^0.8.17;

contract State
{
    enum user{
        allowed,not_allowed,wait
    }
    user public u1=user.wait;
}
  
 
 
 

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;

contract Demo {
    // Mapping to store roll numbers and associated values (e.g., names)
    mapping (uint => string) public roll_no;

    // Setter function to set the value for a given key (roll number)
    function setter(uint keys, string memory value) public {
        roll_no[keys] = value;
    }
} 
 

 
 
 
  
 
 
  
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
  
 
  
  
 
 
choose two (1 paybal ether than ,where to send ether ) (2 choose different ether to deploy ) 
   
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
The Payment gateway for Web3 ... 
 
 

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