I wanted to ask about getting to know someone before getting marriage. I have been to speaking to someone and i want to know what the limits of hijab are when it comes to conversations such as these? What can be considered haraam, makruh, mubah etc?

Every thing haraam with non mahram woman is haraam with her, the removal of the hijaab and looking at her with tight cloth is once permissible only not on a regular basis. Yes it is permissible that they both share some private sensitive information with each other but should never ever share it with other. Trust is a very serious matter.

Talking should not be associated with any lust.