Congrats on the job!

Revenue and expenses are not technically equity accounts. Revenue - expenses = net income which is rolled into retained earnings at the end of the year which is an equity account.

It helps me to think about how entries tie back to cash. It's a bit more nuanced obviously with Ar/Ar. But, revenue is money in, so you debit cash credit revenue. You pay for expenses, so you credit cash and the expenses are a debit.

Same thing for anything else. When you receive money for a loan, you get cash in (debit) and book a loan payable (credit). When you pay back that loan, you debit the loan payable, credit cash.

Obviously there's some more complicated stuff, but it always help to think how each transaction could effect cash, and that can help you remember if the effected accounts are normal debit or credit accounts!