Hello, Anna. I, personally, do not do puzzles or tactics. I play mostly 1 day per move games. This gives me time to look at each move and its consequences, or, potential. After a number of games, some patterns are noticeable, and I try to put them in the memory bank. Even when there are no noticeable patterns, the whole of the game lets me understand why piece x is where it is, and why I put it there.
When I see combinations of moves that are new to me, that is what I would consider my "training". It gets me thinking about the what-ifs, and their possibilites.
I had seen composed puzzles, like those of W.J. Baird, Frank Healey, E. Wallis, and puzzles or tactics from actual FIDE rated games
What is your preference for homing in, or sharpening your focus on the game,
Please note that W.J. Baird, Frank Healey, E. Wallis are of public domain and are widely available on the net
Puzzles from FIDE rated games can be found from CB Magazine
Will not list the sample sites here, unless ADMIN or MOD is ok with it
Thank You.