Hi,
I have a question about video 7 on Financial accounting. It was explained that Revenue and Expense accounts need to be zeroed out at the end of the period. I noticed that at the end of the video Inventory was also zeroed out but nothing was mentioned about why or how that happened. Please can you let me know if Inventory should be zeroed out and how you account for it?

All "revenue" and "expense" account balances are closed into "retained earnings" account at the end of the "year" (not period).
Inventory is an "asset" account therefore its balance is not closed into retained earnings. There is a typo in the slide where 0 is shown in inventory. You can see that accounting equation is not balanced in the slide due to the mistake. (Just imagine 10DB instead of 0 against "inventory") Sorry for the mistake and and hence the confusion.