The personalfinance subreddit is quite good in terms of learning and getting questions answered. I use beancount, it is a great fit for a specific type of user

The personalfinance subreddit is quite good in terms of learning and getting questions answered. I use beancount, it is a great fit for a specific type of user who can put up with double entry and who wants to run sql-ish queries on their transactions and who doesn't need a GUI. It probably won't work if you are not all those things but if you are it is great. Conceptually, I would suggest looking into books that do a basic job of explaining accounting- balance sheet, income statement, cash flow. While it is a much bigger space than the world of personal finance, personal finance itself has gotten very complex, with lots of seemingly indistinguishable places/apps to put money. The indistinguishable becomes just crisply defined if one has the basics of accounting.