If you find a mistake on a SharePoint page, you should find who made the change before you fix it. That way you can inform the person of their mistake.
As long as you are using the Text Webpart (aka the Rich text editor), you can easily see the exact changes made in each version of the page. See the advantages of the Text Webpart in this rule: Do you know why to use the Rich text editor over the Markdown editor?
Figure: SharePoint | Page details
Figure: SharePoint | Version history

Figure: SharePoint | View color-coded changes
Figure: Show actions | Version History
Figure: Version history listed
If you want to see how this is done in Azure DevOps, read Do you know the benefits of using source control?