If you play Germany and finally research the Tiger 1, most players think, theyre invincible. However, this is wrong because its armor can easily be penetrated by a IS 2 or a Sherman Firefly. Instead, you need to angle (turn your Tiger about 45° to the enemy), so the armor gets way thicker. Also don`t rush into the map. Sit back and snipe roads, where many enemies are driving(to a capture point or something) because the gun is also very powerful. Another problem is that many players just rush for the Tigers and ignore lots of other very good German tanks (Panthers, Panzer IV,…). Always try to make at least a lineup for 3 or more tanks because you can get way more kills. I hope i could help you a little bit because I started Germany as my first nation and got some experiences how to play tanks!