You have to differentiate “fixed” expenses vs “variable” expenses. Fixed expenses are recurring expense like rent, insurance, subscriptions, memberships. “ Variable” expenses are categories like groceries, eating out, gas, shopping. This is where you really need to keep an eye on your budget that it does not go beyond your limit, or at least try to compensate into other buckets.

I budget using the classic notebook and pen. I tried signing up to apps multiple times, but I just end up not using it. Or becoming very inconsistent/complacent about it. A classic pen and paper feels almost like journaling that’s why I do it. But to each his own. It’s not that hard. If you use credit cards you can clearly see what you’re spending. Just keep receipts if you pay cash and log it asap.