Here is a link to the WoT website with all the changes made in the past patches up to where we are now. 0.8.3. 

You can find very helpful facts that will change your gameplay expierence drastically if you can understand what is in front  of you! If you dont understand come ask us! 

                                http://worldoftanks.eu/game/guide/en/release-notes/release-notes-83