1) Understanding Cryptography by Christof Paar et al. I learnt cryptography from the 1st edition. Its very practical and highly recommended - https://www.cryptography-textbook.com/

2) Cryptography: Theory and Practice by Douglas Stinson et al. This is a more mathematical treatment and hence a nice complement to the Paar book above - https://www.routledge.com/Cryptography-Theory-and-Practice/S...

3) For understanding how cryptography is used in Networks see the classic Network Security: Private Communication in a Public World by Radia Perlman et al. The 2nd edition is where i started my journey into network security/cryptography needed for my then job. Highly recommended - https://www.amazon.com/Network-Security-Charlie-Kaufman/dp/0...

The first two books give you the "mechanisms" (and theory) of cryptography i.e. the building blocks. The last book puts everything together to implement "policies" via practical applications (eg. IPSec/SSL etc.) for the real world. They are complementary and hence should be studied together to get the full picture.