Please be as specific as possible when letting us know what is missing or incorrect. For example, say "this game's trophy difficulty should be 8/10", with a link to a website corroborating this difficulty estimate (if possible), not "this game's trophy difficulty is wrong".
The official V-Rally 4 roadbook introduces you to all of the game content: environments, vehicles, categories, etc. It contains lots of practical information as well as advice on the best way to tackle each challenge.