I have only one teacher. I also have some language exchange partners.

I'm currently learning french and basq... so, two different teachers

Hello Younis! It depends entirely on what your goals are, and how much time you have available for lessons. A student of mine books lessons with various tutors so that he can have lessons (especially for Speaking practice) with tutors that have different accents. Also, some tutors are better at teaching grammar and others are better at offering speaking practice so you could have more than one tutor to teach you what they are good at. Different teachers' have different teaching styles which could keep things interesting. Some tutors would prefer you to only book classes with them so that they can keep track of what you are learning - this also eliminates duplication of information (which can happen). I hope that helps!