I hear that! It's one of the only counter-intuitive things I do in my garden. Instinct says to protect the plants at all costs! But indeed, this is one thing that if done properly can be very beneficial. There are so many ways to cultivate cannabis, from au naturale (let Nature do what it wants) to something much like bonzai (total micromanagement of the structure of the plant). Everybody has their strategy, usually developed over time. But assuming your plants are in good health, and you don't want just one big bud in the center, I recommend topping them. I usually do mine sometime between 4 and 6 weeks after germination.

I was very nervous my first time, and did a video about it, which is unavailable now except the thumbnail:

https://images.hive.blog/768x0/https://ipfs.io/ipfs/QmSGx8wguDZo4r8bsY3e2eanvmcdc5nHjrPT1YwKV7A7Uo

By my next update or two, I think you'll feel confident about doing the job when the time comes! They recover quickly.