Here's a step-by-step tutorial on how to make a ball using crochet:
1. Make a slip knot and chain two stitches.
2. Work in six single crochets.
3. Make two single crochets in each previous stitch.
4. Alternate between two and one single crochets.
5. Complete three rounds of single crochets.
6. Single crochet decrease during the next round.
7. Stuff the ball.
8. Decrease again.
Here's a link to a more detailed tutorial with pictures on [wikiHow](https://www.wikihow.com/Crochet-a-Ball) that you can follow along with.
I hope this helps! Let me know if you have any other questions or if there's anything else I can help you with.
