I don't have a lot of sources and GNU Cash had a problem with importing my bank's output XLS files. So every three months (quarter) I copy paste my transactions

I don't have a lot of sources and GNU Cash had a problem with importing my bank's output XLS files. So every three months (quarter) I copy paste my transactions into an excel sheet. I have one account that I use for unimportant and small transactions. So all the small transactions get separated from the main accounts which I track meticulously. I categorise transactions and I know exactly how much money I've spent on all the different categories.