Obsidian is a Markdown editing app popular with students and researchers.
Open a Hugo website in Obsidian
File > Open Vault > Open Folder As Vault > Select the folder containing your Hugo website
Tell Obsidian to use Markdown formatting:
Settings > Files & Links > Use WikiLinks > False
Edit your Hugo site in Obsidian
Simply click your Hugo website pages in the left sidebar and edit the content in the main window using Markdown formatting.
Synchronize edits to your website
Install the Git plugin to sync your changes to your GitHub repository:
Settings > Community Plugins > Search for Git
Click Install, and after installation, click Enable
Now you can create or edit a file, and then click the command icon
>_ and Commit all changes
Finally, click the command icon
>_ again and click Push to upload your changes to your website repository in the cloud
Assuming no errors, your website will typically update 5-10 minutes after you sync your edits to your GitHub repository.