Google has recently changed how you can use the Google Keyword Planner. Before, everyone who signed up could see the search volume for keywords. Now, it only shows estimates. There is a way to get around this. You need to create a Google Adwords campaign. The amount you spend doesn’t matter. After you do that, you will regain access to the search volume.
You can also add the campaign name here such as facebook_offer or summer_sale or new_product_lineup or anything else for that matter. Be sure to separate the spaces with underscores. And, if you're placing ads on Google, YouTube or any other platform, and you're bidding for keywords, place the campaign terms in there, separated by plus signs such as best+running+shoes or best+mens+polo+shirts or anything else for that matter.
This philosophy is beautiful in its simplicity, and it serves to correct the “more, more, more” mentality of link building. We only want links from relevant sources. Often, this means that in order to scale our link-building efforts beyond the obvious tactics, we need to create something that deserves links. You have links where it makes sense for you to have links. Simple.
#16 is interesting because no one really knows about it. Myself and a former colleagu did a test on it about 4 years ago and published our results which conculded what you are saying. Since then I’ve been careful to follow this rule. The only issue is that often times using the exact kw does not “work” for navigation anchor texts. But with a little CSS trickery one can get the code for the nav bar to be lower in the code, prioritizing contextual links. I’ve also seen sites add links to 3-5 specific and important internal pages with keyword rich anchor texts, at the very top of the page in order to get those important internal links to be indexed first.