A few things I can think of:
1. use a live iso
2. 2FA and strong passwords
3. if possible, don't use the internet
4. sandboxing
5. use as a single purpose devices. If one is compromised it won't affect the other
6. don't put your data on servers. The web is very hostile, not safe.
7. reduce screen time. The most memorable moments of our lives are not at a computer screen
A few things I can think of:<p>1. don't use the same password on your accounts<p>2. avoid public Wifis. If you do use public Wifis, VPN.<p>3. use 2FA whenever possible<p>4. use strong passwords, nothing identifiable to you (no birthdates, no pet names, etc)<p>But in the end, if the service you signed up for doesn't employ security best practices or saves your password in plaintext, there's nothing really you can do.