You can start having fun with this topics: Good topics on security and privacy

Best to use cold wallets like wallet on airgapped device, hardware wallet or paper wallet.
Web wallets are the most vulnerable to online attacks while other online wallets (mobile and desktop wallet) are not as safe as cold wallets
Avoid malware
Enable ad blocker like ublock origin on desktop
Do not click on ads
Stop using search engines like Google and other commons ones, use search engine like Duckduckgo
Use broswers like Tor, Duckduckgo or Firefox
Best to enter URL rather than searching. Be careful of fake sites.

To have more idea, enjoy those topics.