How can I learn my foreign lover's language?

I decided to learn his language for my foreign lover. How hard is it to learn a foreign language? How can I find out, what are your suggestions?
Updates:
16 d
I forgot to mention in detail. My lover is a Turkish and he wants me to learn Turkish.
16 d
Hey dear gag members, not give duolingo suggestion. Street mouth, slang language and basic words are taught in duolingo. I want to speak this language like my mother tongue. There is also nothing more silly than learning a language from an app. Give reasonable suggestions, please.
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