Sheets Systems Lead: governance and team training

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I'm learning "Sheets Systems Lead: governance and team training" on The Future Market. Lesson 1: "The lead's job: map the team workspace".

What the lesson teaches:
- Before this course: Sheets Systems (course 7.2.3). You built one well-documented system. A lead looks after many files and many people, so the first tool is a register: one row per important file.
- A register usually records: file name, purpose, owner, where it lives (My Drive or a shared drive), general access, whether it holds personal data, connected tools (forms, scripts, reports) and the date of the last review.
- Where a file lives matters. A file in someone's My Drive is owned by that person. In a shared drive, members share ownership of the files and folders, and if someone leaves the shared drive, the files they added stay. Shared drives are only available for work or school accounts.
- General access has three settings: Restricted (only people given access can open the file), Anyone with the link (anyone on the internet who has the link can open it without signing in) and, for work or school accounts, your organization.
- Start with the riskiest files: personal data, money, anything shared with Anyone with the link, and files nobody has reviewed.
- Where this fits: Google Cloud offers an Associate Google Workspace Administrator certification for people who manage a Workspace environment (user accounts, Drive sharing permissions, data governance and security). Its page lists a 2-hour exam with 50 to 60 multiple choice and multiple select questions, in English and Japanese, and recommends 6 months of Super Admin experience. A team lead does not need it, but its topics show what your admin controls.

The exercise I'm working on:
Build a register for at least five spreadsheets you or your team use. Count how many are in My Drive, how many use Anyone with the link and how many hold personal data. Write your top three risks with one action each.

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 "The lead's job: map the team workspace" from the course "Sheets Systems Lead: governance and team training".

Here's what the lesson says:
Before you tidy a messy garage, you first look at everything in it and write a list: what it is, whose it is and whether it is safe. A sheets register is that list for your team's spreadsheets. You cannot look after things you do not know you have.

The activity:
Build a register for at least five spreadsheets you or your team use. Count how many are in My Drive, how many use Anyone with the link and how many hold personal data. Write your top three risks with one action each.

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.