Does the look of this first attempt diagnose the problem?

This is my first ever batch of yogurt. Followed Dr Davis’s L. reuteri online recipe:

–2 Glass bowls in yogurt maker –2 tablespoons inulin powder –Starter: 10 tablets BioGaia Gastrus –1 quart of Oganic Valley half-and-half –100 degrees F 36 hours

There’s so much differing information on this, I would really appreciate advice on where to go from here to improve.

Would someone identify the terms for each part of this? Is the solid top whey? Is the liquid unfermented? Should I assume there is good probiotic in both the solid and liquid?

Can I blend this and use it somehow? Drain and use?

Does the separation mean it needed more time? Less time?

Can I use this batch to create a new batch? Or start over?

Thanks in advance for your guidance!