This pattern is part of Tunisian Square Cal.

The squares are made with a double-ended hook, more info in part 1.
There is a tutorial available in part 1, you need to know the basics of Tunisian crochet.
You can use any yarn you like. When you are a beginner use thicker yarn and a larger hook. The size will depend on your yarn, hook size, and tension.
You have to determine your hook size by making a regular Tunisian crochet swatch.
The Cal contains 34 squares in 4 sizes 10/15/20/25 rounds.

Release Dates
Part 1 - available - 2 squares
Part 2 - available - 3 squares
Part 3 - available - 3 squares
Part 4 - available - 3 squares
Part 5 - available - 2 squares
Part 6 - available - 3 squares
Part 7 - available - 3 squares
Part 8 - available - 2 squares
Part 9 - available - 3 squares
Part 10 - available - 3 squares
Part 11 - February 20 - 3 squares
Part 12 - February 27 - 3 squares
Ebook - March 6