This is the most comprehensive guide you will find with plenty of video's to ensure you get the hang of it. You will also learn how to read Patterns. This is a MUST for beginners and experienced alike!
How To: Jogless Colour Change For The Perfect Crochet Stripe - Tutorial I have changed colors in the last stitch since I started crocheting. I feel like the other color change would be best for something not worked in a spiral.
Creating a flat Circle: Single Crochet [sc] : Start with 6 sc and increase 6 sc in each round so that the total stitch count in each round is a multiple of 6 Half Double Crochet [hdc] : Multiple of 8 Double Crochet [dc] : Multiple of 12