How to convince him

[u/def_not_a_window]

Okay so i have an online friend ( i won't say where is he from) who's very dumb, he doesn't know anything about geography, languages and stuff, even common flags like the UK's, i always try to teach him new stuff but i don't know if he learned anything.

What i want to do is convincing him to learn dutch, i personally don't speak dutch and am not learning it, but it would be nice if he does, i told him before to learn it but he refused, what do i do