At first glance, crochet patterns can look like a foreign language. That’s because they use a lot of abbreviations to save space, and make it easier to keep track of where you are in the pattern. Over time, you’ll begin to appreciate the brevity of crochet patterns and become a pro at reading them. There are really only 2 things you need to know when reading a crochet pattern:

Different countries have different words for the same stitches. For example, the British English term double crochet (dc), is actually the same term as the American English term single crochet (sc). As you may imagine, this can get confusing fast. Most patterns begin by defining which country’s terminology they use, as well as any abbreviations used. Here are some common abbreviations used in amigurumi written with US terminology:

Different crochet pattern designers use different formats to convey their instructions. This is also usually defined at the beginning of the pattern. You can expect that there will be repetition of stitches, which is probably the most confusing part to reading a pattern. Some patterns use brackets ((…), […]) or multiplier indicators (*, x), to convey which stitches you should repeat and for how many times.

Crochet patterns by The WaldyWop are written in US terminology, and follow this format:

This means that in Round 4, you will repeat the sequence [2 sc, then 1 inc] a total of 6 times.

What That Looks Like in Practice
You are doing:

[sc, sc, inc]  ,[sc, sc, inc]  ,[sc, sc, inc]  ,[sc, sc, inc]  ,[sc, sc, inc]  ,[sc, sc, inc]

Or written out fully:

Single crochet in the next 2 stitches, then work 2 single crochets into the next stitch.
Repeat this sequence 6 times.

Since 1 increase stitch = 2 single crochet stitches, 1 increase stitch counts as 2 stitches. 1 single crochet stitch counts as 1 stitch.

Stitch Count Explained
2 sc = 2 stitches
1 inc = 2 stitches
So each repeat equals 4 stitches.

That’s why the round ends with (24) stitches.