Singing 2: Intermediate (range, tone, harmony)

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I'm learning "Singing 2: Intermediate (range, tone, harmony)" on The Future Market. Lesson 1: "Your range and voice type".

What the lesson teaches:
- Range = every note from your lowest to your highest. Comfortable range (sometimes called tessitura) = the part where your voice sounds and feels best for a long time. Build songs around the comfortable part.
- Choirs often use four parts: Soprano, Alto, Tenor, Bass (SATB). Voice types overlap, and many singers sit between two types.
- Commonly given approximate ranges (middle C = C4; sources differ by a few notes, and trained singers often go beyond them):
- Voice type - Approximate range - Note
- Soprano - C4 to C6 - Middle C up two octaves
- Mezzo-soprano - A3 to A5 - A below middle C up two octaves
- Alto (contralto) - F3 to F5 - F below middle C up two octaves

The exercise I'm working on:
15-minute range check (soft volume only): - 3 minutes: Singing 1 warm-up. - 5 minutes: on a piano app, sing "ah" from a comfortable middle note down one note at a time. Write down your lowest clear note. - 5 minutes: from the same middle note, go up one note at a time on "oo." Write down your highest easy note (no strain). - 2 minutes: circle the 8 to 10 notes that felt best. That is your comfortable zone for now.

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 "Your range and voice type" from the course "Singing 2: Intermediate (range, tone, harmony)".

Here's what the lesson says:
Your range is all the notes your voice can sing, from your lowest to your highest, like the rungs on a ladder. Some voices have ladders that start higher, some start lower. Every ladder is good.

The activity:
15-minute range check (soft volume only): - 3 minutes: Singing 1 warm-up. - 5 minutes: on a piano app, sing "ah" from a comfortable middle note down one note at a time. Write down your lowest clear note. - 5 minutes: from the same middle note, go up one note at a time on "oo." Write down your highest easy note (no strain). - 2 minutes: circle the 8 to 10 notes that felt best. That is your comfortable zone for now.

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.