Helpful Links for Minecraft Modding - Jacob1225/pufferfish-minecraft-mod GitHub Wiki
The following are links that may be helpful when starting to learn how to mod in Minecraft:
Forge Discord Server: This server has a bot that could convert mcp mappings to mojang mappings in 1.16
Forge Java Documentation (1.16.5): This site has all the documentation of the packages, classes, attributes, and methods used in 1.16.5 Java Edition
mcjunitlib Testing Library: A library that allows unit and integration tests to run on Minecraft servers
Tutorial with examples for 1.16.4 modding: Gives simple working examples of the important concepts in Minecraft and Forge
Many step-by-step video tutorials for 1.16.5 modding: Beginner, intermediate, to advanced video tutorials on 1.16.5 modding
Example mods:
Arcade Mod by KenPham (1.12): Arcade mod that implements Snake and Tetris
CasinoCraft by Epidra2077 (various versions): Arcade mod that implements various games