Recommendations

Free Online Tactics

Lichess Puzzle Dashboard: 

• Openings (highlights your openings)
• Improvement Areas
• Strengths
• From My Games

Train with puzzles from your own games, and from the openings that you play!

Chess Tempo:

• This video talks about the benefits of mixing puzzles, so you are literally looking for the best move.
• Choose Mixed and then the difficulty.

Affordable Phone Apps for Quality Tactics

Chessimo

• Their entire tactics sets (as well as strategy and endgames problems) for around $15.
• Apple App Store & Google Play

CT-ART 4.0

• All platforms.
• Unlock the entire course for about $15.

Websites to Try

Chessiverse

• Play and train against a plethora of bots who play like humans players.

Lichess Studies

• Search, create, analyze and learn from this vast free resource.​