I have a Macbook Pro. I want to uninstall built in apps, like Dictionary. How is this done?
Version 12.4 M1 chip
You can't. Since Big Sur, the OS is mounted on a cryptographically sealed, read-only volume. The OS won't boot if it has been 'tampered with'.
The Dictionary app is less than 15 Mb (most bundled apps are quite small - even Safari is only 14 Mb!), so there won't be a significant saving of disk space.