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Here are some resources I've found especially helpful for my own puzzle-making and codebreaking endeavors.

General Overviews and Websites for Getting Started:

• Cryptography - Wikipedia
  
  
• Cryptanalysis- Wikipedia
  
  
• Classical cipher - Wikipedia
  
  
• Steganography - Wikipedia
  
  
• Transposition Cipher - Wikipedia
  
  
• Substitution Cipher - Wikipedia
  
  
• Polygraphic Substitution - Wikipedia
  
  
• Polyalphabetic Cipher - Wikipedia
  
  
• Ryan Riley's "Introduction to Basic Cryptography" series - Youtube: 1, 2, and 3 (plus several others, just look through his channel)
  
  
• The American Cryptogram Association
  
  
• Practical Cryptography
  
  
• The Black Chamber
  
  
• Braingle
  
  
• Elonka.com
  
  Basic Cryptanalytic Techniques:
  
  
• Frequency Analysis - Wikipedia
  
  
• Coincidence Counting - Wikipedia
  
  
• Kasiski Examination - Wikipedia
  
  Beginner hand-cracking tutorials:
  
  
• How to Solve a Cryptogram - Puzzlebaron.com
  
  
• Vigenère decryption with unknown key - Youtube
  
  Tools for Creating and Cracking Codes Quickly:
  
  
• Rumkin Cipher Tools
  
  
• dCode Crypto Tools
  
  
• Quipqiup Crytogram Solver
  
  
• Cryptii Tools
  
  
• Guballa Vigenere Solver
  
  
• Boxentriq Code-Breaking Tools
  
  Interesting Cryptographic Puzzles/Methods for Inspiration:
  
  
• World's Greatest Unsolved Ciphers (Craig Bauer), Part 1 and Part 2
  
  
• Cicada 3301: LEMMiNO Documentary; Great Big Story Documentary Series
  
  
• Kryptos: Great Big Story Feature; Cracking Kryptos (Elonka Dunin)
  
  
• Enigma: Numberphile videos 1 and 2.
  
  Books for Learning:
  
  
• Cryptanalysis: A Study of Ciphers and their Solution, by Helen F. Gaines
  
  
• The Code Book: The Science of Secrecy from Ancient Egypt to Quantum Cryptography, by Simon Singh
  
  
• The Codebreakers: The Comprehensive History of Secret Communication from Ancient Times to the Internet, by David Khan
  
  Books for Puzzle Solving:
  
  
• The Mammoth Book of Secret Code Puzzles, by Elonka Dunin
  
  
• Cracking Codes and Cryptograms for Dummies, by Denise Sutherland and Mark E. Koltko-Rivera
  
  Games:
  
  
• Cypher
  
  
• Puzzle Baron's Cryptograms