What assumptions do the articles make about the previous level of understanding of physics that the reader has? Also, I'm a bit lost and find the articles not

What assumptions do the articles make about the previous level of understanding of physics that the reader has? Also, I'm a bit lost and find the articles not so "clear" when I just jump in to read a random one - is there a suggested learning path or sequence to read the articles in where they sequentially build up knowledge?