Well tanks are pretty fun to use, the good tank player focus more on dodging shells, then tries to shoot.
For MBT take reactive armor,ir smoke,n machine gun, I use same composition for tank destroyers
First thing being tank that you need to survive as long as you can.
If u know if u have reactive armor it blocks damage from one shell hit. You can reposition urself n face another side of tank which has armor n more likely you will return with less damage teken. Remember if you are in tank fighting suprise is the key. Know where the enemy is hit him in back, for MBT it will be one shot disable if u hit them in back with no armor.
As soon as u take shot, they know where u are so pop smoke sneak behind them give him one more deadly shot. As he will not have any idea ehere the shots coming you are at advantage, one more shot n boom.
The second thing is hit the tank in 90 degree angle it deals 30-45 damage to tank.
Always remember hit him in 90 degree. The next trick is penetrating through your opponent reactive armor, avoid hitting tank in all directions if he has armor, it will be 3 shells wastage n u give up position too. Instead hit him in one direction keep hitting same direction l.
When you are in tank destroyer mobilty is the kry, if they start shooting you first fave another side to them n remember do not give them 90 degree angle to hit u. If they still choose to fire it will be only 17-25 damage. Another thing tanks are great with medium to long rage combat, they are useless in close quarters without proper infantry support.
One more MBT has more damage sustain in front even if he doesn't have armor, avoid hitting them in front.
However I love when any MBT showing front to me, I hit it exactly at the main gun. One shot disable. Which is weak part of MBT. Remember dont give them chance to think about you, kill them before they know where you are