I pay for most things via credit card, review the bill at the end of each month, and put expenses in a spreadsheet. I also include cash withdrawn. Btw, I pay my credit cards in full every month. One of them gives 1.5% flat cash back, the other gives 3% cash back on gas/transit and restaurants.

Amazon prime comes with multiple things, including video and music. But I don’t use it much tbh.

Honestly, buying from Amazon is a turn off knowing how many sellers just drop-ship. I only use it when I need something in a pinch, or when Amazon has a promo. Also, as mentioned in a previous comment, I use Amazon fresh occasionally because honestly their groceries are sometimes (not always) cheaper than local.