There "Category Theory in Context" book by Emily Riehl is also freely available at https://golem.ph.utexas.edu/category/2016/11/category_theory_in_context.html

There "Category Theory in Context" book by Emily Riehl is also freely available at https://golem.ph.utexas.edu/category/2016/11/category_theory_in_context.html https://golem.ph.utexas.edu/category/2016/11/category_theory... (I didn't read it yet)...