A good rule of thumb to follow is that all links should still make sense if the text preceding it is taken away. Take the following for example.
You can learn more about website accessibility companies by reading the article here.
If you removed all the text preceding the link, all you have left is "here". This doesn't provide enough context about the destination of the link. Changing the sentence and link to the following would resolve this issue:
Read the following article to learn more about website accessibility companies.