This is nothing that you learn overnight. It is a very hard skill to learn. Need taking coursese for about 4-6 weeks and then practice at your house for at lease 8 months to a year for 5-6 hrs a day before your are ready to face the real world and work on peoples vehicle. Buying one of those kits your are online is a waste of time and money. Those kits don’t do anything. They are misleading.