Comment by laleck
Not OP but there are a few open source options. GNU cash is friendlier for beginners due to the GUI. I like plain text accounting, specifically beancount.
As far as integrations, GNU cash lets you import from various formats like quicken while beancount has lots of plugins from the community like importers for various banks. I don’t believe either offer invoicing but you could integrate it yourself or just manually record.
IMO, the hardest part of keeping your own books is learning double entry accounting.
Thanks for the recommendation for GNU cash will give that a look. What resources would you recommend for learning double entry accounting?