Bookkeeping - the activity or occupation of keeping records of the financial affairs of a business.
Every company big or small has to keep a log of all the money that goes in and out. It can be difficult for people who don't know how to do it.
The best online bookkeeping software is by far QuickBooks.
QuickBooks is easy to use and has a tutorial to walk you through every step in the way.
Don't Have the Funds?
I've used both, I used wave when I first started and was an excellent tool and would've stayed with it if a majority didn't use QuickBooks. I switched over because I handle bookkeeping for several clients and most are all synchronized with QuickBooks making it an easier sell if I already operate on their software.