Ways to use privacy-invading apps more safely?

I recently became more interested in privacy on the internet. I made some steps (hardened Firefox and added containers, switched from Google search to DDG, disabled some tracking settings in Windows 10, using a browser to access more things on my iPhone rather than using apps, using a V PN, etc).

However, the amount of information to be found about privacy is absolutely massive. So I could really use some guidance on how to use some of the apps I …

apps privacy