#1: Clear out the clutter
When you first are provided access to your Fusion Lifecycle tenant, it will come with example workspaces, scripts, picklists and permission roles and groups. This can make it hard to focus on what is needed to run your production processes within Fusion Lifecycle and can cause confusion when making changes.
Renaming the existing items with a prefix to separate them out from the data you really use is a great idea. I prefix everything with an underscore so they stay grouped together at the top of the lists. This makes it easy to separate out what I really want to see.
Although you can delete the items out, I would recommend keeping them to use for future reference or as a baseline to clone from.