Chess "strategy" at the higher levels tends to be almost synonymous with "positional" chess. It involves trying to gain an advantage which isn't tactical or a material lead. It involves things like controlling an open file with your Rooks, having a safe King, or taking control of key squares. This is a much more advanced concept because utilizing this effectively enough to convert games on it alone probably only starts coming around 1600-1800 chess.com rapid rating range.
As for "pawn play" there is a huge variety here. There are some pawn concepts a sub-1000 player might recognize (like realizing one side has doubled pawns) and others which even Grandmasters struggle to find sometimes (like knowing when to change the pawn structure to their favor with a timely pawn sacrifice).
However, for most levels of chess, I'd say "strategy" is more like "planning." What are your plans in this position? It might be some grand plan that takes 20 moves to realize, but usually these plans are much shorter-term. Things like trying to get castled is a solid plan as might be trying to improve your "worst piece" which was inactive where it was developed to.
Planning in chess should ideally be done in following the needs of the position, but this takes a lot of experience and trial and error to even figure out what those "needs of the position" are in a game (not to mention able to play it).
The answer I gave above should apply to all chess abilities, but for anyone under 1600-ish range, even simplified plans can be an advantage over many opponents. Chess opening principles can help a lot in the opening: https://www.chess.com/blog/KeSetoKaiba/opening-principles-again
as can learning about weak squares and outposts. Remember this topic of weak squares and outposts can be pretty complicated (1600+ ish level), but it can be broken down in an easier explanation when one takes the pieces off the board and just looks at pawns and what squares are weak when pawns advance. This is the same reason that pushing pawns in front of your castled King is usually positionally weakening; I made a video on this a while ago and it might help you think of things in a new way 
How can I for free practice strategy because right now I have just been practicing through implementing what I have learn through games.