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Welcome to Steemit, I can see you are new!!!

If you visit a post on here by my friend @teamsteem -- venture towards the bottom of any of his posts --- he discusses some of what he uses for things like Markdown Pad, etc etc.

The bottom 1/4 of his post are laid out really nicely in a template for all kinds of quick advice like this.

He is also one of the best writers on here.

I'm pretty sure there is. Just google markdown editor for mac and I'm sure you'll find more than one. I know haroopad and I think there might be a mac version of this one.