One of the most important things we can do with and for our Macs is keep them secure as possible. Apple helps with this in several ways one of which is their builtin FileVault disk encryption software. FileVault has been around in the macOS for a long time. In my opinion you may not need to activate FileVault if on a Mac in your home, but if you use a Mac laptop out and about, it might be a very good idea. Check out this video which explains the details of FileVault.