I hope you are all doing fine! I'm a 14 year old student from the UK, and have been really interested in theoretical physics, but before I reach that I need to build on more basic knowledge. So I set out to learn calculus and some linear algebra, mostly from Khan Academy and 3B1B's videos on the topic. However, I can't find much content for Classical Mechanics online. Are there any websites or maybe textbooks that you can recommend me, so that I can further my knowledge on this subject!
P.S. The last time I asked my teacher if he could point me in the right direction, he just told me to keep my head down, but I know I am capable of learning complicated concepts, it is not beyond me :)