Grey Post button of Doom! Why I was blocked from Posting on Steemit?

I was experiencing a technical issue for a few days, trying to figure out:

Why the post button was staying grey with a block symbol, not letting me post.

Solution!

There must be word written in the tag section or it won't let you post, it can not be a symbol or a number either or else you will see red text at the bottom.

Examples

This is how you want it to look:

I wrote in the tag box help steemit tutorial in the box above the post after the and it magically turned black. YAY! Now I can post this!