Do you have tips for the use of stuart?
Sorry for the delay - I have a few.
-Stuarts need a follow up, just one Stuart is not effective on its own. 2 Stuarts can work in combination to take down even medium armor. Use chain stunning and follow up with an engine critical at close range. Panzer IVs can be reliably taken down with a couple of Stuarts. The Panzer might not even get a single shot off if you activate the stuns in succession. Watch out for Pak or Pup support!
-The abilities of the Stuart can be even more useful later in the game when you are facing medium or heavy armor and have armor of your own. Punish enemy armor that's out of position or pushing forward with stunning and follow up with your tank destroyer or medium armor.
-My last tip has to do with vet. Did you know Stuarts require the same vet as the M8A1 Howitzer Motor Carriage (which is just a Stuart with a different gun, after all)? That vet 2 Stuart crew can become a vet 2 motor carriage. The reason this is important is for the ability to pop smoke at vet 1. In addition, you don't lose the abilities of the Stuart by rotating out the crew because they are inherent.