Reddit reviews Your Baby Is Speaking to You: A Visual Guide to the Amazing Behaviors of Your Newborn and Growing Baby

These are a couple books/resources I found most helpful:

https://www.amazon.com/Heading-Home-Your-Newborn-Reality/dp/1581108931

https://www.amazon.com/Your-Baby-Child-Birth-Five/dp/0375712038

https://www.amazon.com/Your-Baby-Speaking-You-Behaviors/dp/0547242956

https://www.healthychildren.org/English/Pages/default.aspx

https://www.circleofsecurityinternational.com/

https://www.marchofdimes.org/nursing/modnemedia/othermedia/states.pdf (This is a great explanation of newborn states of arousal. However, I think the information at the end about co-sleeping may be out of date at this point.)

This is my favorite breastfeeding resource. If you are formula feeding, the AAP book as well as Penelope Leach's book both have good guidance. Formula fed babies, like breastfed babies, should be fed on cue/demand, and allowed to determine their feeding volume and schedule. https://education.possumsonline.com/programs/gestalt-breastfeeding-online-program

http://www.zerotothree.org is a great reference for normal development and milestones.

This is a great read about co-regulation, or the process of how babies and children learn to self-regulate:

https://fpg.unc.edu/sites/fpg.unc.edu/files/resources/reports-and-policy-briefs/Co-RegulationFromBirthThroughYoungAdulthood.pdf

Lots of people hate on Ferber, but his book Solve Your Child's Sleep Problems has good information on sleep cycles. You don't necessarily have to implement all his techniques, although in some circumstances they are useful.

There are a lot of different soothing techniques out there. The Happiest Baby on the Block covers the basics. Most newborns like to be held flexed with firm touch. They like movement. They like to be close to another human. They like access to their hands. A baby who is in a frantic or crying state (see the march of dimes link) often needs help to come back down to a quiet alert or drowsy state, and soothing by an adult caregiver can be the key. You don't necessarily have to soothe them all the way into sleep, though, especially as a newborn. Sometimes just getting them calm and drowsy is enough that they can do the rest. In addition, a baby who is crying too frantically will have a hard time latching on to a breast or bottle so it is a good idea to feed before they become frantic since it can be difficult to soothe them if they are frantic with hunger. However, even offering a pacifier or finger to suck on, gently bouncing, or holding them can help them get calm enough to eat.