Where can I learn the best breastfeeding techniques?

Read, nurse, doctor. There are many sources for help with breastfeeding. There are a variety of books available, however often times getting help in person is the best. Ask at your pediatrician if there is a lactation nurse available to meet with you. Often times your doctor will be able to evaluate your baby's latch and give you some helpful pointers as well.
Breastfeeding Consul. There are a couple of ideas you can try. Breast feeding consultants are a great resource for all things breastfeeding related and should be very adept at working with you on techniques that work best specifically for your anatomy and your baby as welll as your personal preferences. You can also frequently get good tips from close friends or relatives that breastfed themselves and worked well.