After a little advice for when making changes to my site is there any type of maintenance message i should display and take the site down or should i keep it live and just make the changes?
Not sure as fairly new to this and want to keep my customer base happy.
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This is an accepted solution.
The best thing to do would be to duplicate your theme, work on it then once you're ready publish it!
Here's more info from Shopify itself: Duplicating themes · Shopify Help Center