Hey @TT first off - welcome to the Community, secondly - there’s no such thing as a ‘newbie question’

1. What is a Lifecycle Stage**?**
Lifecycle Stage is a default HubSpot property, designed to designate where contacts are in your marketing funnel. Each stage represents a transition down the inbound sales/marketing funnel - they cannot be customized, but you can determine HOW they are applied.
2. The first lifecycle stage of a contact depends upon how the contact was created in HubSpot:
- For contacts added manually in the HubSpot CRM, the default Lifecycle Stage is always Lead.
- For contacts who were added by converting on a HubSpot marketing form or lead flow, the default lifecycle stage is Lead unless otherwise specified on the form.
- For contacts who are imported in using a .csv file, you will have the option select a default lifecycle stage during the import process. Learn more about importing contacts here.
3. How HubSpot CRM updates the lifecycle stage of Contacts/Companies:
- The CRM will update the lifecycle stage of Contacts or Companies when they first become associated with a deal and when that deal reaches a deal stage with a 100% probability (Closed Won).
- When a Company is associated with a deal, the lifecycle stage will update to ‘Opportunity’.
- When a Contact is associated with a deal, the lifecycle stage will update to ‘Opportunity’ provided they do not have their lifecycle stage set to ‘customer’, ‘evangelist’, or ‘other’.
- Once a deal associated with a Contact or Company reaches a deal stage with 100% probability (Closed Won), then the lifecycle stage will update to ‘Customer’.
You can manage this setting under Settings > Deals > toggle the setting to turn it off or on.
Note: When the lifecycle stage of a Company is updated, the lifecycle stage of all Contacts associated with that Company will also be updated if ‘Lifecycle stage sync’ is enabled within Settings > Companies.
…There’s a lot to digest there, but what I hope this helps clarify how Lifecycle Stages are designed to work in line with the HubSpot product and sales methodology. I’ve seen a few experts on thsi Community - CC @Samantha_Alford @Josh @kcooper - provide some great insights on CRM best practices.
All the information above is pulled directly from HubSpot’s Knowledge Base.