I will second (third?) that MacOS native dictation is pretty good now -- it's better than Dragon ever was for me because Dragon wouldn't let me dictate obscenities, which really put a damper on my creative writing when I couldn't type. Depending on the OS and model that you have, regular text dictation can be activated by using either a dedicated function key (it's F5 on my M1 Air) or earlier versions will have a different command -- on my old Mac, it was hitting Fn twice.
If you need system voice control in addition to text dictation, you can turn that on in System Preferences > Accessibility > Motor > Voice Control. It works pretty well these days although as far as I can tell they took away the ability for you to set a wake word for it (e.g., "Computer, scroll down"), which was a thing I liked about previous versions.
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If you need system voice control in addition to text dictation, you can turn that on in System Preferences > Accessibility > Motor > Voice Control. It works pretty well these days although as far as I can tell they took away the ability for you to set a wake word for it (e.g., "Computer, scroll down"), which was a thing I liked about previous versions.