Solidity Crash Course - Part Basics and Pre Requisite

Solidity Speed ​​Course -Part 1: Basic Knowledge

? Welcome to the first part of the Solidity Speed ​​Course!

This guide covers the basic knowledge of solidity, blockchain, transactions, GAS and Ethereum virtual machines (EVM).

? What is a blockchain?

Blockchain

is a decentralized, unsatisfactory ledger, which is used to record transactions safely. It consists of blocks, each block contains a series of transactions, which form a chain together.

? The key feature of the blockchain:

decentralization

→ No central organization controls it.

• Uncomvitrable → The transaction after the record cannot be changed.
Transparency
• → Anyone can verify the transaction. Security
→ password technology to ensure data integrity.
• ? Transactions in the blockchain
• transaction is the transfer of value or data on the blockchain. In Ethereum, the transaction can be:

Ether coin transfer

→ Send ETH between accounts.

Contract interaction → Call the function in the smart contract.

✨ Example: Basic trading structure
• ? Part of the transaction part:
• From & To → Sender and receiver address.

Value

→ The number of Ether coins sent.

<code>{
  "from": "0xSenderAddress",
  "to": "0xReceiverAddress",
  "value": "1000000000000000000", // 1 ETH in Wei
  "gas": "21000",
  "gasPrice": "5000000000"
}</code>

Gas & Gas Price

→ execute costs.

• ⛽ Understand the gas Ethereum needs GAS
to execute transactions and smart contracts. GAS is the measurement standard for calculating the workload.
• ? GAS's importance:
• Prevent spam → Users must pay to use the network.
compensation for miners

→ Incentive transaction verification.

Manage the network load

→ More complicated operations require more GAS.

? ️ Example: GAS estimates

? ️ The basic knowledge of Ethereum virtual machine (EVM)
• Ethereum virtual machine (EVM) is the runtime environment for executing smart contracts. It ensures safety and decentralization.
• ? The key feature of EVM:
isolation
• → contracts to run independently. Status management
→ track all accounts and balances.

Smart contract execution

→ Run Solidity bytecode efficiently.

<code>// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

contract GasExample {
    uint256 public value;

    function setValue(uint256 _value) public {
        value = _value; // 简单操作 → 低Gas成本
    }
}</code>

? Summary

✅ Blockchain is a decentralized ledger . 🎜 Trading involves Send ETH

or

Call the smart contract

. 🎜 GAS is used for Payment of calculation costs and guarantee network security

. 环境 EVM implements
• smart contract execution in a safe environment.

  ? Next step >

  In Part 2

  , we will introduce smart contracts, functions and storage in Solidity. Stay tuned! ?

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