Tennis Performance: tactics, match analysis and tournaments

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I'm learning "Tennis Performance: tactics, match analysis and tournaments" on The Future Market. Lesson 1: "Your performance baseline and ratings".

What the lesson teaches:
- A World Tennis Number (WTN) is a rating scale from 40 (beginner) to 1 (elite professional). It is available to all players regardless of age, gender or ability. Players must be at least 9 years old to receive one (according to Tennis Canada; check your own national tennis association for local details).
- WTN is calculated from match results. It predicts each match from both players' ratings and then adjusts them by the actual result. Recent results count more than older ones, and sanctioned competition counts more than recreational play. Each set is analysed as its own result, so the score matters. Canadian WTNs update weekly, on Wednesdays (Tennis Canada).
- To get one: create a free account on the Matchplay Platform (tc.tournamentsoftware.com), opt in to sharing your matchplay data with World Tennis in Account Settings, then play recorded matches such as sanctioned tournaments, community leagues, ladders or club matchplay entered on the platform. A match needs at least one completed set. About 6 matches is a rough guideline for an accurate rating (Tennis Canada).
- NTRP, the older level system, cannot be converted to a WTN, and the calculation cannot be appealed. For missing or wrong results, contact the event organiser first (Tennis Canada).
- A rating is a guide to find fair matches. It is not a measure of your worth, and it can change as you play.
- Your own match baseline is a set of numbers you count yourself:
- Baseline number - How to calculate - Why it matters

The exercise I'm working on:
Play or film two practice sets (with permission). Count the five baseline numbers for each. Write the average and one goal for the number you want to improve.

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.
4. This is for learning only. Remind me to check with a licensed professional before I make a real decision about my own money, health or legal situation.

I'm a parent helping my child (about 8 years old) with a lesson called "Your performance baseline and ratings" from the course "Tennis Performance: tactics, match analysis and tournaments".

Here's what the lesson says:
A good player is like a good scientist: they measure first, then change one thing. Before you plan tactics, you need honest numbers from real matches. Ratings help you find opponents at the right level. Before this course: Tennis 2: consistent rallies, spin, serve placement and doubles (course 10.1.2), which builds on Tennis Fundamentals (course 10.1). This course assumes you can rally crosscourt, hit a reliable second serve, return from a good position, volley, and you already know how to count first-serve percentage and film a practice set. If any of that feels shaky, go back to course 10.1.2 first.

The activity:
Play or film two practice sets (with permission). Count the five baseline numbers for each. Write the average and one goal for the number you want to improve.

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.
Keep it general and educational. This is not advice for a real situation.