Games where a well-thought-out plan is crucial, not mere hand speed. You need to position your fighters correctly, exploit cover and terrain, and anticipate your opponent's moves. Tactics can be turn-based or real-time, but they always reward attentive players.
Turn-based tactics give you time to consider each move. Real-time tactics are faster, but allow you to pause the game to issue orders.
Is it difficult for a beginner?The first missions usually teach the basics, and you can choose the difficulty. The main rule is: protect your soldiers and use cover.
You can download tactical games via torrent: the filters above will help you choose by language, size, and build type.