What books on tactics would you recommend? I also found some pdfs:
-Winning chess tactics, Seirawan
-Back to basics tactics, Heisman
-Learn chess tactics, Nunn
-Chess tactics from scratch, Weter-something
-Tal's winning chess combinations, Tal
-Tactics time, Brennan (this one is not better than lichess tactics)
Are those good? Which one should I read -first? Or maybe are there better ways to improve my tactical skill?