discardothediscarded said:
Question: Can I get a warning for posting a low quality post? Friend of mine asked me to post his semi-shitpost here and I am afraid to lose my account.

Depends on how shit that shitpost is.

If it meets the uploading guidelines, it will stay.
If it doesn't, it will be deleted.
https://e621.net/help/uploading_guidelines

If it breaks site rules, you will get a warning.
If it doesn't, you won't.
https://e621.net/help/rules

It's not rocket science.