Asking here is a horrible idea. You will only get meme tier advice like "learn to program" , "install gentoo", and learn electronics.
You are asking information technology questions. You should probably study information technology, as opposed to programming, or electronics. If you know absolutely nothing CompTIA maintains some entry level IT certifications, or test material and objectives, on information technology , that might be a good place to start. You could consider CompTIA A+, NET+, SEC+. You don't have to take the tests, but could, but you would learn a lot systematically by doing this about computers, computer repair, networking and security.
Hopefully, after reading the SEC+ book, you will realizing why asking unqualified questions like "What is the most secure browser" is non-sense.