Go here to do the chess lessons:
https://www.chess.com/lessons
and just to do some normal tactics go here:
https://www.chess.com/puzzles
Study paths created by Chess.com for people below 1399
#1 Beyond The Basics
#2 Beginners: The Opening!
#3 Beginners: Tactics!
#4 Beginners: Strategy!
#5 Beginners: The Endgame!
#6 Beginners: Bringing It All Together!