Essentials need to add for Track inventory, cost of goods, popular items, and get notified when inventory is low.

Essentials does not do inventory. You would have to upgrade to Plus or Advanced to get inventory features.

Good morning, @lyjoseph9.

As @john-pero stated, QuickBooks Online Essentials doesn't have the Inventory feature. 

To compare all the features in the subscriptions, you can visit https://quickbooks.intuit.com/pricing/ to see all the plans side-by-side. If you like to upgrade your current subscription, here's how:

1. Go to the Gear icon ⚙ at the top-right of the page, then Account and Settings.
2. Navigate to the Billing & Subscription tab.
3. In the QuickBooks Online section, select Upgrade. 
4. Choose the plan you want, and press Upgrade.
5. Confirm your payment information and hit Save.

Thanks for reaching out to the Community! Have a nice day.