Take care what you install

Only install software from reputable companies.

Do not install any software you fancy. Some of this will introduce security loopholes or "backdoors" which hackers can exploit.

Worse still, some software is deliberately designed to enable hackers to gain access to your computer. Just because the software tool or "App" you are using seems to do what  you want it to do, it is quite capable of doing other things that you would not want.