You may already have an idea of what websites you want to pitch, or you may be starting from scratch. If you don’t know where to start, check out this list here of 300 websites that accept guest posts. Now you just need to find those relevant to your website.

Another way is to use search operators.  Just replace the keyword with your chosen topic. E.g. email marketing inurl:write-for-us.

Go through each website and evaluate whether a link from them will be worthwhile. If it is, pitch them some content ideas.

One important thing to keep in mind here is that these opportunities are easy to find. Your competitors are likely doing the same thing.