Livestock Production: herd planning and biosecurity

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I'm learning "Livestock Production: herd planning and biosecurity" on The Future Market. Lesson 1: "How many animals can your farm carry?".

What the lesson teaches:
- Stocking rate is the number of animals on a pasture during a month or grazing season. Carrying capacity is the average number of animals the pasture can support for a season without being harmed (Manitoba Agriculture).
- Extension offices often use the animal unit (AU): a 1,000 lb (450 kg) beef cow, with or without a nursing calf, which needs about 26 lb (11.8 kg) of dry matter forage a day. An animal unit month (AUM) is the forage one AU eats in a month, about 780 lb (355 kg) of dry matter (Manitoba Agriculture).
- Manitoba's worked example: 30 cows for 4 months is 120 AUMs. On 160 acres, that is a stocking rate of 0.75 AUM per acre.
- Carrying capacity formula from the same guide: animals supported = carrying capacity in AUMs divided by the grazing months. A 200-AUM pasture over a 4-month season gives 50 animal units. That is 50 cows of 1,000 lb, but only about 33 cows of 1,500 lb, because bigger cows eat more.
- Overstocking means more animals than the land can sustain. Extension sources describe a negative spiral: the animals damage the pasture, and the pasture then grows less. Understocking wastes forage.
- Carrying capacity changes from year to year with rain and forage growth, so check it each season.
- Not every farm is a pasture farm. For indoor pigs and poultry, the limit is housing space per animal, water, feed delivery and manure handling. Use your national code or your vet for space numbers (course 2.17.2, lesson 2).

The exercise I'm working on:
Work out the carrying capacity of one pasture or house you own or could rent, using a local forage figure or housing code. Compare it with the number of animals you want.

I'm stuck. Please:
1. Explain the main idea in plain, simple words with one everyday example.
2. Walk me through the exercise one small step at a time. Ask me what I've done so far before giving the next step.
3. Don't just give me the final answer. Help me do it myself, and check my work when I share it.

I'm a parent helping my child (about 8 years old) with a lesson called "How many animals can your farm carry?" from the course "Livestock Production: herd planning and biosecurity".

Here's what the lesson says:
A pasture is like a picnic. If too many guests come, the food runs out and everybody goes hungry, and the grass cannot grow back. So before you add animals, you work out how much food your land grows and how much each animal eats.

The activity:
Work out the carrying capacity of one pasture or house you own or could rent, using a local forage figure or housing code. Compare it with the number of animals you want.

Please explain this so an 8-year-old understands: short sentences, a fun everyday example, and no hard words.
Then give me 3 simple questions I can ask my child to check they understood, and a way to do the activity together, one tiny step at a time.