Things to consider when changing template
Whilst it is quick and easy to install and publish a new template as your DEFAULT template, there are a number of things to consider both BEFORE and AFTER you change template.
First things first.
Uninstall any old templates that are no longer being used.
Reason: not uninstalling old 3rd party extensions (including templates) will increase the risk of your website being compromised by hackers.
Things to do BEFORE changing Template
Perform a full backup of your website.
Reason: installing 3rd party extensions (including templates) may break your website.
Things to do AFTER changing Template
Avoid uninstalling the old template being replaced until you have checked the new one is performing as expected.
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