Orders, Lots and Margin: how a trade actually works (education only)

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I'm learning "Orders, Lots and Margin: how a trade actually works (education only)" on The Future Market. Lesson 1: "Order types: market, limit, stop, stop-limit and trailing stop".

What the lesson teaches:
- Market order (SEC, Investor.gov): an order to buy or sell immediately. It guarantees that the order will be executed, but does not guarantee the execution price. It generally fills at or near the current ask (when you buy) or bid (when you sell). The last traded price is not necessarily the price you will get.
- Limit order (Investor.gov): buy or sell at a specific price or better. A buy limit fills only at the limit price or lower; a sell limit only at the limit price or higher. FINRA notes the risk: there is a chance your order does not get executed at all.
- Stop order (also called a stop-loss order): an order that waits until the price reaches the stop price, then becomes a market order. A sell stop sits below the current price (often used to limit a loss on something you own). A buy stop sits above the current price (often used to limit a loss on a short position).
- The stop price is not a guaranteed execution price (SEC investor bulletin). It is a trigger. The fill can be significantly different from the stop price, especially in fast markets (more in Lesson 6).
- Stop-limit order (SEC): when the stop price is reached, it becomes a limit order. You control the price, but it may not fill if the price moves past your limit. The SEC's example: a sell stop-limit with a stop of $3.00 and a limit of $2.50 becomes active at $3.00 but can only fill at $2.50 or better.
- Trailing stop (SEC): the stop price is a set percentage or dollar amount away from the market price. It moves with the price when the price moves in your favour, and stays fixed when the price moves against you.
- Time in force (FINRA): a day order expires at the end of the trading day if not filled. A good-til-canceled (GTC) order stays active until it fills or you cancel it, but firms set a limit on how many days it can stay active.

The exercise I'm working on:
On paper, the practice price of XYZ is $50. Write which order type you would use to describe each instruction, and whether it guarantees a fill: (a) "buy now"; (b) "buy only at $48 or less"; (c) "sell if it falls to $46"; (d) "sell if it falls to $46, but not below $45.50"; (e) "sell if it falls $2 from its highest point". (Answers: market, fill yes; buy limit, no; sell stop, becomes a market order; sell stop-limit, no; trailing stop, becomes a market order.)

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 "Order types: market, limit, stop, stop-limit and trailing stop" from the course "Orders, Lots and Margin: how a trade actually works (education only)".

Here's what the lesson says:
An order is a message to your broker: "please buy" or "please sell". Some orders say "right now, whatever the price". Some say "only at this price or better". Some wait quietly and only wake up when the price reaches a line you chose.

The activity:
On paper, the practice price of XYZ is $50. Write which order type you would use to describe each instruction, and whether it guarantees a fill: (a) "buy now"; (b) "buy only at $48 or less"; (c) "sell if it falls to $46"; (d) "sell if it falls to $46, but not below $45.50"; (e) "sell if it falls $2 from its highest point". (Answers: market, fill yes; buy limit, no; sell stop, becomes a market order; sell stop-limit, no; trailing stop, becomes a market order.)

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.