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If you really want to dive into classical physics, buy a beginner’s textbook and start reading. Simply reading the concepts will not be enough to really understand. You must also review the sample problems and try your hand at some of the questions at the end of each chapter. Take the time to process the derivations of the basic equations of motion and truly understand why they work before you move onto the next concept. Reading a textbook on your own might not be enough for you to gain the depth of knowledge you’d like in physics. There are many open courseware and online courses you can take related to physics. Many of these courses have assignments to check your understanding and forums to discuss the work. These types of courses are also easy to fit into your schedule as you can work on the material when you have the time. Physics is a subject best learned through hands-on activities and solving practice problems. Do some basic experimenting and see if you can derive the equations based on your data. Answer all of the questions at the end of each chapter and check your solutions.  Seek out more problem sets online for concepts that are more troublesome than others. Physics builds upon itself, so continue to do practice problems until you feel that you have mastered the concept before moving on to the next one. If you work best in a classroom setting, check out the courses available at your local community college. Choose a course with a well-rated professor during a time that fits well into your schedule. Taking a course just because you’re curious about the material can be really fun and you’ll be more likely to focus on the work and truly learn the subject. Take advantage of office hours and open lab times to discuss concepts that may be causing you trouble.

Summary:
Read a beginner’s physics textbook. Take an online physics course. Experiment and do practice problems to check your understanding. Sign up for a basic physics class at a local college.