You can find lots of great cheat sheets to help remind you of important stitches and to help with graphs and charts. Here is a list of a few of them.
1. Dabbles and Babbles: https://www.dabbleandbabbles.com (Crochet Symbols & Direction Charts)
2.Crocheter’s Ultimate Cheat Sheet: Https://www.unravelknit.ie
3. The Crocheter’s Guide to Troubleshooting Patterns!: https://www.freshstitches.com
4.Standards and Guidelines for Crochet and Knitting: https://www.yarnstandards.com
5. Crochet Abbreviations Chart: https://www.lepetitsaintcrochet.com
These are just a few websites I have found that have free printable charts to help you as you teach crochet or if your a newbie yourself. All of the charts were free at the time of this posting. If this helped you in anyway please leave a comment or send me an email to let me know. If you know of other cheat sheets that should be included in this list send me an email and I will upload the information to keep it current.