The Mac's Calendar is easy to use. It's easier with these tips. Keyboard shortcuts, usability tips, links to shared calendars: it's all here.
It's great that you set up a Time Machine backup. But is it working? Find out now. Here are two ways to check.
Malwarebytes Anti-Malware is the best thing for cleaning up malware. It's also free. (It used to be called AdwareMedic. It''s still great.)
1Password is already super-handy, but if you trigger it from the keyboard it's better. Here's how you activate 1Password from the keyboard.