There are a bunch of online services, and it’s hard to figure out who’s doing a good job unless you’re an expert. This list only has services most people need. There are lots of other secure solutions for each of these categories; this list only includes those I already know to be good.
Note: I am not compensated by anyone, in any way, for any item on this list: it comes only from my own professional analysis. Weird, I know.
Recommended Online Services
Google G Suite
Microsoft Office 365