for me the first one sounds better because it is in the past progressive form. You started learning English many years ago and you are STILL learning it until now.

I've been learning English for many years This is present perfect which says you started learning English sometime in the past and you are still in the process of learning. I've learned English for many years This is in present perfect and it's not quite correct I guess, cause the verb 'learn' here would imply that you have learned just about everything. learning is a continuous never ending process. You could rather say I have studied English for many years, which would sound just fine.

I have been learning is continuing education that is continuous tense I have learned past tense if still continuing the studies use first one u done class already use second one

*true

" I ve been learning " is tru if u r going on learning english. But if u want to say that i learned u should say " i ve learned ".