To allow your computer to type what you say, see the following guides on using the built in dictation features for Windows, Apple and Chrome environments.
On a Windows computer:
https://support.microsoft.com/en-us/help/4042244/windows-10-use-dictation
On an Apple computer:
https://support.apple.com/en-us/HT202584
On iOS devices:
https://www.imore.com/how-enable-use-and-disable-dictation-iphone-and-ipad
Within Goolge Docs:
https://www.pcworld.com/article/3038200/data-center-cloud/how-to-use-voice-dictation-in-google-docs.html