Even after reading all the official documentation and various articles on the internet, you might want to ask a few questions specific to your situation. Here we are listing out few free resources which could help with this.
First of all note that the German consulate has visiting and calling hours for asking questions! This should be your first go-to resource of getting any official answer. The calling hours are mentioned on the city's web page. For example for Bangalore, it is mentioned as follows:
They also have visiting hours. Unfortunately, they are not mentioned on the website. You should definitely visit the consulate if you have something important to be clarified.
The helpline is busy, however, you should be able to connect after few tries.
Facebook groups are great source of getting suggestions on your specific question and ask for clarifications. The information is of course unofficial but mostly reliable.
We highly recommend the INDIANS IN GERMANY (DEUTSCHLAND) Facebook group for Indians. The group is very active and helpful. You should also try searching the group before posting the question.
You should join the above group even if you do not have any specific visa question. It is a great source of information even during your stay at Germany.
The forums on Toytown Germany are a great information resource for English-speaking foreigners.
The forum Visas/permits is dedicated for visa and permit related discussions. This is especially useful for international communities other than Indians.