As my first content, I would like to introduce some of the great websites we can utilize to learn any topic we ever wanted to. Most sites are absolutely free. All you need is a strong motivation and to sign up for an account. Please go to https://www.lifehack.org/articles/money/25-killer-sites-for-free-online-education.html to see the complete list although I personally recommend Coursera, Khan Academy, and edX. It might not be enough to learn the whole subject, but it is certainly more than enough to expand your knowledge on anything you set your mind to.
