This is a great guide to help when reading a written pattern:

This is a chart I found from Dabbles & Babbles to help with reading crochet charts and shares the US (American) Terms and the UK terms as well:

There are many different sizes of hooks, you can see the Number/Letter that correlates with the millimeter size for gauging your project:

Here is a little cheat-sheet to help when reading a written pattern. There are symbols that can become confusing, this diagram shares what those symbols mean. That can help sort out some confusion. I found this from one of my favorite designers, Stacey Trock.

Below are measurements for different sole sizes when you are making crocheted shoes/booties/slippers.

Different countries/languages have different terminology for crochet stitches. You can find translations here to help convert your pattern: [Image found on Pinterest]

Here is another chart to help with Netherlands (Dutch) Crochet terms and GB (Great Britain/UK) terms:

You can usually make your blankets as small or big as you want, but here are the typical sizes for blankets if you are trying to make something in a specific size.

For countries that use the metric system, here are the conversions for blanket sizes:
Baby: 101.6 cm X 152.4 cm
Throw: 152.4 cm X 121.92 cm
Lapghan: 91.44 cm X 121.92 cm
Twin: 99.06 cm X 190.5 cm
King: 193.04 cm X 203.2 cm

This is an awesome chart I found on Pinterest that gives sizing for any size hat. It tells you when to stop increasing (Crown Circle Diameter) and when to fasten off (Hat Height) for all hat sizes:

Below you will see a chart for yarn weights. In my video tutorials, I share what size yarn I use, and some questions have come up about the weight and ply. If you cannot access the same brand of yarn as I use in my video tutorial, you can use any brand that is the same ply/weight: **WPI=Wraps per inch**