In general, when starting a side income blog, you will find search engines like Google favour updated content, as it shows your site is active and providing accurate information to readers, building trust.
When spending time making a post and it can benefit from an update, I think it’s likely a good move and a positive return on investment (ROI) to give it an update, as the resources used to make it will be better utilised doing so than creating another post. It also expands on a topic and provides accurate information to your audience, improving your authority on a topic.

