What is the best source of decompiled Minecraft source code for reference? Should I decompile it myself, and if so, how?

[Felix_2000]

I need the Minecraft source code to figure out how to use some classes that my mod needs. I'm new to modding, and my understanding is that Minecraft code is obfuscated, so the best way to figure out how it works is to see other references within the code. I'm wondering if there is a repo that people have made with decompiled source code and maybe even some touchups, comments, and documentation on previously confusing parts. I've decompiled Java before, but I seem to recall it was a bit of a hassle.

So two questions:

1. Is there a good source for viewing Minecraft source code already out there?
2. If not, what decompiler should I download and how do I use it for this purpose?

[LexManos]

Setting up the Forge MDK creates the source on your machine. You can use your IDE's source browser/debugging tools to navigate it. Anything else is illegal and we do not support it.