Not enough reputation - wanting to answer/comment
123416
How am I supposed to ask questions if I don't have enough reputation to comment?
37700
How can I ask for clarification on a question I'd like to answer if I can't add comments?
35561
Why don't high rep users ask questions?
60001
How can I post an answer with many links, or earn that privilege without being allowed to post such quality answers?
61716
For protected questions, require local reputation to comment
32219
Asks a question; never responds to answers/comments
7842
How does a lurker gain reputation to receive privilege for commenting?
50407
Can I draw attention to a well deserving answer on my question?
3779
How do I get attention for one of my own questions without a good answer?
105169
No reputation for editing questions?
114888
How come I can't give more than 500 rep?
98107
Different types of reputation?
59896
Why can't we ask for opinions?
95144
separate reputation for questions and answers
128814
So annoyed with no-comment, vindictive downvoting
122243
When to answer vs when to just comment
7341
Why there isn't reputation points for successful flagging?