I would like help preparing my papers for next years taxes like keeping receipts and ect to get the most from my tax return.

I would like help preparing my papers for next years taxes like keeping receipts and ect to get the most from my tax return. Which receipts should I be keeping if any? I live in Texas zip 79904 and don't think I get tax returns on groceries or gas. Also I donate often, well above a grand in clothing and more but I give it to goodwill. Their receipt doesn't show what I donated, it just is proof I was there and donated which is the same whether I give them a box of clothes or just a pair of socks.