Probably both strategies are valid, but I began now to focus on a small number of exercises (1100, in the website Chestsofsable). I think that learning tactics by spaced repetition is probably less time consuming and perhaps more effective to improve in tactics in a short period of time. What do you think?
You are evidently unaware that promoting another chess website is frowned upon by management.
Do what you want but don't expect us to say, "ooh yes, that sounds much better."
What do you think is the best strategy to improve in tactics? Do you think is better to learn well a rather small number of tactics, let's say 1000 or 1500, or try to solve tactics from a large pool of exercises, as for instance in TT in chess.com?
Probably both strategies are valid, but I began now to focus on a small number of exercises (1100, in the website Chessable). I think that learning tactics by spaced repetition is probably less time consuming and perhaps more effective to improve in tactics in a short period of time. What do you think?