Here are a few options:
* Я учу (ya uchu) - This is the most general way to say "I am learning," and it works for most situations.
* Я изучаю (ya izuchayu) - This is more formal and often used for learning a subject or skill in depth.
* Я изучаю (ya izuchayu) + [object of study] - You can use this with a specific object of study, for example: "Я изучаю английский язык" (ya izuchayu angliyskiy yazyk) - "I am learning English."
Here are some examples:
* Я учу русский язык. (ya uchu russkiy yazyk) - I am learning Russian.
* Я изучаю историю. (ya izuchayu istoriyu) - I am learning history.
* Я учусь играть на гитаре. (ya uchus' igraty na gitare) - I am learning to play the guitar.
The choice between "учу" and "изучаю" depends on the context and the level of formality. In most casual situations, "учу" is sufficient.