There are many ways to hack. There are only 2 main tips for avoiding this, but each of them is very important.
1. Activate two-factor authentication. Apply two-step user authentication to protect mail from hacking. You can use different means of two-factor user authentication, most services offer to enable SMS authentication or install an application to generate one-time passwords, but hardware tokens are the most effective.
2. Vigilance. You should carefully monitor which addresses the messages come from, do not follow unverified links, never publish your phone number in the public domain on the network, use different passwords for each account. Also, never follow the links or download attachments from letters that you received from an unfamiliar addressee.
These little things have long been known to everyone, and against the background of the tricks used by hackers, they may seem ineffective. But this is not the case. They can protect you from hacking.
