Learning languages that are very close together

Hello all!

Currently, I am learning Russian and Serbo-Croatian. I am thinking about adding Polish, but I am curious if having a third language that is very close to these two would do more harm than good. So if you have learned languages that are closely related, I’d love to hear from you! If you haven’t, I’d still love to hear your opinions.


If you are learning 2 languages that are close, it’s really important to know one of them much better than another and at least not to start 2-3 languages from the beginning at the same time.
I don’t know French very well and that’s wehy I always confuse French and Spanish words.
But I never confuse or mix German and English words because I know both languages quite well.

Thanks for the input! I used to mix up languages, even if they were not close, because I would get so excited to practice the language, that I would just forget what I was saying :stuck_out_tongue: