Portfolio Concepts: diversification, costs and behaviour

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I'm learning "Portfolio Concepts: diversification, costs and behaviour" on The Future Market. Lesson 1: "From single investments to a portfolio".

What the lesson teaches:
- A portfolio is all of your investments taken together, across all your accounts (for example, in Canada, a TFSA, an RRSP and a non-registered account).
- The asset mix (also called asset allocation) is how your portfolio is split between asset classes. GetSmarterAboutMoney describes three main classes: cash and cash equivalents, fixed income (such as bonds) and equities (stocks). Alternatives such as real estate and crypto assets can also be included.
- GetSmarterAboutMoney says your asset mix will largely determine the risk and expected return of your portfolio. That is why it looks at the mix first and at single picks later.
- What shapes a mix: your goals, your risk tolerance (how much loss you could handle emotionally and financially), your time horizon, whether you want growth, income or both, and your wider situation (debt, income, stage of life).
- A mix is not permanent. It is worth reviewing when goals change, when the time horizon gets shorter (for example approaching retirement) and after big life events such as a new job or buying a home.

The exercise I'm working on:
Make the one-table view of an example or real portfolio: classes, amounts, percentages. Write the goal and time horizon next to it. Use made-up numbers if you have no investments.

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 "From single investments to a portfolio" from the course "Portfolio Concepts: diversification, costs and behaviour".

Here's what the lesson says:
One toy is just a toy. All your toys together in one big box is your collection. A portfolio is the big box: everything you own that is an investment, looked at as one team instead of one player at a time.

The activity:
Make the one-table view of an example or real portfolio: classes, amounts, percentages. Write the goal and time horizon next to it. Use made-up numbers if you have no investments.

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.