Mac Mail app couldn't send or receive. Settings were right, and the account worked on an iPhone. Cleaned with Malwarebytes-- problem solved.
macOS Catalina (10.15) requires 64-bit apps. Here's a quick way to check your apps and get a list of those that are not 64-bit.
Safari stores passwords, if you know where to look! Here's where. This is way easier than resetting a forgotten password. Just look it up.
It's great that you set up a Time Machine backup. But is it working? Find out now. Here are two ways to check.
Here's how to fix the "error -9923" issue (an error occurred when communicating with the scaanner). It takes just a few moments, and it works.
Here's how to extract hi-res icons for the apps on your Mac. Great for use in how-to tutorials. Also just plain fun to look at. Someone worked hard on these.
You can't print an ePub (Books) document. But you can convert it to a PDF, and then you can print that. Use the free Calibre app, right on your Mac (not some sketchy online service).
Evernote can mysteriously open at login, even when it's not a Login Item in the Users & Groups preference pane. Here's how to make it stop.
Delete part of a Messages conversation on your Mac and keep the rest of the conversation intact. Delete bad photos & those accidental swear words.