Remix IDE

Remix Online
Remix Desktop
remixd (connect to localhost daemon)

VSCode Extensions

Solidity Ext (Juan Blanco)
Remix Ext
Truffle Ext

Local Blockchain and Client Tools

Brave
Metamask
Geth
Mist
Ganache

Solidity Basics

First SmartContract
Code Style
Structure of a Solidity Source File
SPDX License
Pragma
DataTypes and Variables
Ether Units
Global Variables
Functions
Control Structures
Loop Structures
Event
ErrorHandling
Custom Error
Compile
Gas Optimization
Deploy on blockchain
Solidity Versions Changelogs

Calls

External Function Call
Low-Level Calls
send(), transfer()
fallback(), receive()
call, staticcall, delegatecall

Object Oriented Programming

Visibility modifiers
Function Overloading
Modifier Overloading
Inheritance
Abstract Contract
Interface
Library, import

Solidity Patterns

Signature Verifying (ECDSA - ecrecover)
Multi-Sig Wallet
Merkle Tree
Payment Channel
Payment Splitter
Batch-Distributor
Gas Abstraction (Gas relay, Pay in tokens instead of gas, GSN)
MetaTransactions (gasless - Delegate Gas payment)
Factory
TimeLock
Access Control
Oracles

Upgradability

Data Sepration (Eternal Storage . ERC-930)
Delegate Proxy (ERC-897)
Universal Upgradeable Proxy Standard (UUPS . ERC-1822)
Standard Proxy Storage Slots (ERC-1967)
Transparent Contract Standard (ERC-1538)
Multi-Facet Proxy (Diamonds . ERC-2535)
Metamorphic Smart Contracts (CREATE2 . ERC-1014)
Minimal Proxy (Clone Factory . ERC-1167)

SmartContract Frameworks

Truffle
Hardhat
Foundry

OpenZeppelin

AccessControl (Role-based, Ownable)
Address, String, Arrays
SafeCast, SignedMath
Hash Utils, Base64
BitMap, Checkpoints, DoubleEndedQueue
EnumerableMap, EnumerableSet
Context, Counters
Vesting, Governance
Pausable, ReentrencyGuard
ERC-20, ERC-721, ERC-1155
ERC-165, ERC-2981
ECDSA (SignatureChecker)
MerkleProof
Metatx (ERC2771)
Multicall
Proxy (Create2, ERC-1967, Beacon, Proxy Admin, UUPS)

Certora

ChainLink Oracles

PriceFeeds
VRF (Random Numbers)
AnyAPI
Automation

Unit Testing

Chai, Mocha
Assert, before, after
Fork Sandbox
JavaScript Tests
Solidity Tests
OZ Test Helper
Remix UnitTest Plugin
Apeworx

Security

Exploits
Pitfalls
Hardening
Slither
Graph