The Minimum Daily Charge (MDC) is the least amount that you will pay PG&E for connecting you to the grid which is currently $0.32854/day or $119.92/year. This goes up to $0.33260/day or $121.40/year on 1/1/2022.
At the annual True-Up if you are a net consumer (black bill Cumulative Energy Charges or Credits is positive) then the total of the MDCs that you already paid are subtracted from the Cumulative Non-Bypassable Charges plus the Cumulative Energy Charges (NBCs + Energy Charges - MDCs) . If the result is negative then you don't owe anything additional. If the result is positive than that is what you owe in addition to the MDCs that you have already paid. If you are with a CCA then there is a second True-Up that is usually in April when you will be billed for the cumulative net generation costs.
At the annual True-Up if you are a net generator (black bill Cumulative Energy Charges or Credits is negative) then total of the MDCs that you already paid is subtracted from only the Cumulative Non-Bypassable Charges (NBCs - MDCs). If the result is negative then you don't owe anything additional. If the result is positive than that is what you owe in addition to the MDCs that you have already paid. Also, if you aren't with a CCA then PG&E pays you $0.02-$0.03/kWh for the excess as credit on the bill. If you are with a CCA then that true-up is usually in April and you will likely get more back as either a bill credit or a check in the mail.
A TED talk would be too short to cover everything, I'm thinking of a 3 credit course for a semester.