Tests I need to do to ensure the security of my website

What tests should I do to ensure the security of my site? read in this post some of the things I should do and wanted to know if it's the right thing to do. [1] https://chat-to.dev/post?id=28 And in this second post, we'll show you the important points to keep in mind. [2] https://chat-to.dev/post?id=123