There are many folks with much experience to share. It depends on what your interests are. Find the threads, and join in on the conversations. Rifles, optics, reloading and just a few to get started. Cartridges and calibers is another very good thread to check out.
If you reside in the UK, or Australia try www.ballisticstudies.com as their knowlegebase is very thorough regarding rifle calibers and their associated ballistics. I have use this forum and Nathan Foster's ballistic research for years. If your intent is to hunt for game ballistic studies is an excellent starting point. Terminal Ballistics Research (TBR) is a business that was formed to educate hunters and shooters worldwide. This is delivered via our online cartridge knowledge base, our tutorial books, hunting tutorial services and rifle accurizing services (including self learning via our bedding products and tutorials).