For online = There are ample free articles, videos, and blogs by real traders who explain forex trading really well. You can either choose these free versions, or opt for paid courses. Check the review of the courses, and select only the best courses.
For offline = You can buy books about forex trading and learn from there. You can also hire a mentor to teach you about forex trading, what it is, and how to proceed. Or, if you have any friend or relative who trades, simply ask them to teach about trading too.