All of these activities are related and are highly dependent on the analysis of your web server logs. Beware, excessive linking, either internal or external can lead to the exact opposite results. Make sure that every link serves its own purpose in your content. Google is acutely concerned about the user's experience. It has been for a long time and this is nothing new. These days Google rolls out several algorithm updates per day. In the past, search engines cut description tags at exactly 160 symbols, but in the mobile age it's no longer about the exact numbers. But it didn't happen.