Roulette is a game of luck, so thinking more than necessary is essential. So tips and tricks will work a lot.
The ball can land on any number or colour, so it is impossible to calculate based on the previous results.
The 13 chip trick can be used by placing the chips on 13 numbers of equal distance.
Martingale strategy is known as the double up method. If you win, bet on the betting unit in the next turn. If you lose, bet double on the betting unit in the next turn. Double martingale is the variation of martingale which many professionals use.