The SRB2 Wiki is a collaborative effort to provide helpful information such as walkthroughs, instructions, and tutorials. If you're unsure how something in SRB2 is supposed to work, this is a good place to start looking for answers.
Releases for SRB2 v0.X and v1.X. These threads are ancient, so don't be surprised to find broken download links. Files with working links should function properly in the game versions they were created for.