It is better to show these things with visual examples. Here are some strategic ideas.
http://www.thechesswebsite.com/good-bad-bishop/
http://www.thechesswebsite.com/chess-outposts/
https://www.youtube.com/watch?v=5PPpl4TPctA
http://www.thechesswebsite.com/open-vs-closed/
I am a little bit down in Middlegame and In Chess Strategy,
Please give em some tips to improve both.