What are the tool use to get feedback on a documentation, and how to your define your role in a startup mostly when you are trying to volunteer to gain experience
hello and welcome back to fcc forum 
- do you want to contribute to open source projects?
- do you have any particular project/s in mind?
if so then looking into their open issues or contribution guidelines will give you more in depth take on their processes.
happy coding
The best way to get feedback on your documentation is to ask your users for their feedback. Another great way to test documentation is to grab a friend and ask them to try using your website or application by following the documentation. Silently watch them do this exercise and make note of any difficulties that they have.
I don’t understand the second half of your question.
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