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Long passwords are generally more secure and take longer to hack using a "brute force" attack.
Don’t reuse passwords on different accounts.
This way if one account is hacked it does not lead to a breach of all your accounts.
Use two factor authentication when available.
This provides another level of safety even if your password is compromised.
Don’t use “remember password” option in browsers.
Anyone with physical access to your device could quickly have access to all of your personal information.
Use a password manager.
Password managers generate strong passwords (strong enough that you likely couldn't remember them on your own) which you access with one master password. There are paid and open source options available.
The private browser option stops cookies from being saved on your device as you visit websites, and wipes your data when closed. It is a good idea to use, just keep in mind that it does not hide your browsing from your internet service provider.
Don’t go to questionable sites.
Learn to identify suspicious sites, and err on the side of caution.
There is no such thing as free.
Every time you sign up for a "free" service on the internet, you are actually paying with your data and privacy.
How to know/address being tracked online
It is almost impossible to entirely avoid online data collection and tracking these days. But you can try using internet browsers like Tor, Orbot, or Onion Browser, search engines like DuckDuckGo, Qwant, and Startpage, and virtual private networks (VPNs) like TorGuard and NordVPN.