There are a few strategies for self learning physics. The first one is about using different online courses. Luckily, you can find many of them on such resources as Coursera, edX, and Udemy, among others. After finishing many of them, you can even receive a certificate proving your competence.
The second option is to teach yourself through books. For instance, experts in physics often recommend Stewart’s calculus book and Giancoli’s Physics text. After reading such materials, you will have a basic understanding of physics. Moreover, to have a good knowledge of mechanics, you should read David Morin’s Introduction to Classical Mechanics.