If I had to put it in three things to focus on:
1) launchers (Know your launches and what to combo after you get one)
2) Ingore blocking the poke lows (Only lows to really worry about now are the knock-down lows, easier to see knock-down lows becuase they take start-up animation)
3) Movement, movement, and movement. (Tekken in its most basic form is make the other player whiff(Miss) and then punish with a launcher.
And here are some resources I've collected from other GAF'er post for beginners:
Resources for new players:
Character overviews:
https://www.youtube.com/watch?v=Nbewxse8DlI
Top ten points for new players from other fighting games:
https://www.youtube.com/watch?v=onfgm7ifwhQ
Tekken neutral space for beginners:
https://www.youtube.com/watch?v=PCKGGWNFXKw
Video on throw breaking:
https://www.twitch.tv/videos/149888227
Website(s)
Tekkenzaibatsu . Com
Shoryken . Com
Top 15 moves for each character:
https://drunkardshade.com/2017/05/27/tekken-7-top-15-moves-for-all-characters/
How sidestepping works, its a video for Tekken 6 but some of it still applies to Tekken 7.
https://youtu.be/wuLhI7Co8CA
Also youtube "Level up your game" 80%+ of the Tekken 6 stuff will be applicable to T7.
Also youtube Basic to Pro:
https://youtu.be/JxSzUSeYtkU