Apple products often come with an air of invincibility, and through the years, they’ve shown resistance to threats in ways Microsoft computers aren’t privy to. This, however, does not mean that Macs aren’t invulnerable.
Viruses that affect Macs
There are four general virus types that hit Apple products, and their effects can range from merely annoying to downright destructive:
Adware
Adware are unwanted programs that bombard users with pop-up advertisements.

Did your Mac slow down after you installed macOS Mojave? Or do you suspect that its sluggishness is caused by nearly empty memory storage space? No matter what caused your Mac to slow down, things are not hopeless. Here are some ways to speed it up.
Clean up your Login Items
The Login Items list (or “Startup List”) contains all the apps and programs that automatically start when you log in.