New to Bitcoin. How do I ensure the safety of my funds?

I am in the process of moving a sizeable amount of fiat into bitcoin. It feels weird to see the number of bitcoin in a digital wallet and equate that to money (compared to using a banking app or website). I feel like I am missing something, or not taking every precaution possible in order to protect the asset. Can anyone relate to this? Is it really as simple as 1.) never store your seed online, 2.) never input your seed anywhere else except the hardware wallet itself, 3.) have proper backups of everything ?

Edit: would add 4.) Use high entropy seeds and passphrases