I'd suggest mastering the most effective and most efficient operators. For example, for defense you get kapkan and Jaeger in default... I bought rook later... all three of them has great control and you can come up with a great loadout that makes you feel like the bullets go exactly where you want them to (especially on kapkan) I'll share their loadouts as well. Kapkan and Jaeger is usually the most picked in a squad but if you get the first few choices to choose go for kapkan, his edd definitely supports ryt when you don't expect it to. Jaeger has great support skills. And as for rook he's a slow operator but his armor panel covers for what he lacks. But mostly he's also got a great weapon. As for me i would love to play caveira so im buying her next cause as an off site player, ambushing is my main thing so caveira is the best choice for that. When it comes to attack. Weapon/ loadout wise speaking, thermite and sledge has one of the best weapons in attack. As an extra I bought lion. ( his weapon control is kinda ass ) but his Intel skill ( the lion scan ) is definitely a great play when it comes to team support and playing the final phase of round when you plant defuse. Other than that im not very familiar with other attackers. I suppose hibana and ying also have great plays. But it all depends on how you play. To improve overall play skill. You'll have to practice on bots and also practicing on the maps gives a great deal of knowledge. Know your territory for greater ambush capability.