What is meant by "Plan out the optin and sales flows in your business?” in Activecampaign

I'm new here and trying to get up and running with ActiveCampaign automation. I am just in the process of learning about how to add tags properly. Before I start creating the tags for my business I need a little help. Could someone please explain what is meant by "Plan out the optin and sales flows in your business?” My business offers a least 3 different lead magnets and various products and services. Could someone provide an example of what planning out the optin and sales flow looks like for the purpose of creating tags?