monter des mailles serrées sans chainette de base
Great tutorial on how to seamlessly change colors in crochet from Petals to Picots blog
How to Seamlessly Change Colors in Crochet - Petals to Picots
Katie's Crochet Goodies and Crafts: How to add straight edges to chevron
How to join grannies with the join as you go method (JAYGO).
African Flower Hexagon Join-as-you-go Tutorial