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It sounds like the video is saying (link with a time stamp corresponds the following)

So we use this a lot of the times when we're talking about body parts, tools, or instruments; things that help you do things. Okay, so we've covered a lot of ground here.

cambridge dictionary gives this explanation about ground

the surface of the earth or of a piece of land

to connect a piece of electrical equipment to the ground with a wire

none of them fits this case.

what does ground mean in "a lot of ground"?

1
  • @FumbleFingersReinstateMonica Thank you so much. Would you please move your comments to answer? I'll accept it. – peterpanai Feb 9 '20 at 21:19
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It's a common "spatial" metaphoric usage, similar to The negotiations covered a broad area, or His talk touched on a range of subjects.

In OP's exact context, figurative ground refers to the range of topics discussed...

We've covered a lot of ground
=
We've talked about a wide range of subjects

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