i want to sell guest post on my site where are the best places to sell guest post on the Internet ?
Also what is the best Wordpress plugin that visitors submit their guest posts
Linking to other sites to aid your readership might be useful.
But selling links (which is your undertone) on any domain destroys your reputation in Google, thus makes your guest posts untrusted, thus makes your domain something to avoid.
It doesn't take much to go from one extreme to the other.
You can't avoid posting webspam by promoting you allow webspam to be posted.
There are some facebook groups available for guest posting. Give it a try.
I haven't found any that are worth it. Perhaps you can advise some? lol