I use a combination of Quicken and Excel. Quicken is my check register and serves many purposes: 1) can be tailored to meet your revenue and expense categories, 2) allow for split transactions (useful for credit card statements), 3) reports can be designed in many different ways, 4) allows for multiple accounts (checking, savings, investment, etc.), 5) reconciliation feature. It can do much more but is a solid program that meets most of my needs. There is a learning curve and requires you to input data.
Im a retired accountant who used Excel extensively when working. Excel is a powerful software program that allows me to build projection models, I.e, future and present value calculations, what if models.
Also, there is a website calculator.net that has a ton of calculators that can help you answer a lot of financial questions.
Good luck to you. It’s tough getting started but worthwhile in the end.