Welcome to the Wefugees community and thank you for reaching out to us!
There have been a lot of questions on the platform already that discuss obtaining a residence permit. Depending on your situation (if you want to work or study in Germany, if your the parent of a German child, etc.) there are different requirements and documents you will need to collect in order to apply.
Here is a Berlin Service website with all the necessary information in English (you can select what kind of residence permit you wish to apply for on the right): https://service.berlin.de/dienstleistung/324661/en/
Please feel free to reach out to us again if you have any more questions!