I was told by a Google My Business representative to include #{keywords} in my description. I was told this would boost my rankings. Has anyone else heard of this?

I have done the research and have compiled a list of a little over 100 keywords that are highly connected to our industry. I have used the metrics to rank those keywords and have given the top 50 of them a ranking. My intention is to use them on my site and make sure that all of my pages have a keyword focus. In doing this, I am running into some challenges. Any insight would be helpful. 1. There are numerous keywords that have simple variations in them. I am trying to figure out if each variation needs it's own page. I have read articles (here on moz) that say that one page can rank for several keywords, and other articles that say that a simple variation can need it's own page. Not sure what to do here. Below is an example of what I mean. (examples: "my long tail keyword" , "my long tail" , "my long" , "long tail" , "long tail keyword" , "keyword long tail") 2. Will it help to create a page for each one of the 50 or even the full 100? I have the opportunity to use blogs and FAQ's to assist with content creation. 3. Since my brand ranks well and is obviously tied highly into my site, do I worry about including brand terms in my keyword focus or should I just focus on those search terms?