

Chess.com or Lichess.
The ones you play as White and Black.
Each one names the pattern it drills.

Random puzzles train random things. Your openings decide which positions you actually reach.
A lesson is ten puzzles from those openings, at your level, including the threats you need to see coming.
No, they come from the openings you play.See From your games for positions from your own games.
It helps: connected, the lesson uses the openings you play there.
Yes. Misses come back in the summary at the end.
60 of every 100 lost games are a missed tactic.Free to start, no card needed.
Start free