While the Solve Tactics mode is undoubtedly the meat of the of the Tactics web app, there are two other modes that provide a very different sort of training, excellent to stay sharp. Both are based on trying to solve as quickly as possible, but each with a slightly different angle. They are also the perfect trainer for bullet chess. You will also find part one demonstrated in a video!
Tutorial and video (7:37 m) by Albert Silver
Most players look at endgame study as a necessary evil, akin to taking a very bitter medicine, that may yield results, but is boring. However, what if your study of endgames was punctuated at every corner and turn by fireworks and wondrous moves? This can be achieved, at least partially, thanks to the Studies app from ChessBase Account, making your study of endgames much more fun!
Tutorial and video (14:46 m) by Albert Silver
There are many ways to train tactics, from methodical themes, to deep positions, and while all have their place in a player's arsenal of training tools, there is one that specifically targets speed of recognition and play: the Tactics Sprint. If you feel like you want a method to improve your ability to see and play tactics in minimal time see this intro with video!
Tutorial and video (21:10 m) by Albert Silver