Dictation commands for navigation and editing on an iPhone 11?

Due to an injury in my shoulder, I'm relying more and more on iPhone dictation to write emails and WhatsApp messages. It works like a charm when my words are understood correctly. However, I have been unable to find commands to navigate, corrected misspelled/misunderstood words, and edit partially written messages. Are there commands for this? Or is there a way to program them? I don't need very specialized functions. Just navigation and editing.