Self-Employed Tax Concepts: records, deductions and instalments

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I'm learning "Self-Employed Tax Concepts: records, deductions and instalments" on The Future Market. Lesson 1: "Records that stand up to a review".

What the lesson teaches:
- In Canada, under the Income Tax Act, business records must be kept for a minimum of six years from the end of the latest tax year they relate to (CRA). Other countries set different periods (see In your country below).
- The CRA's list of source documents includes sales invoices, purchase invoices, cash register receipts, formal written contracts, credit card receipts, delivery slips, deposit slips, work orders, cheques and bank statements. The CRA says that if you are unsure whether an item matters, keep it.
- Records must show an audit trail: a path from the source document (paper or electronic) to the summary numbers you report.
- Records can be paper, electronic or both. A scanned copy is acceptable if it is readable by the CRA. Electronic records must stay in an electronically readable format even if you also keep a paper copy.
- Records must be kept in English or French (or translated), and generally in Canada. Records kept outside Canada can be accepted if a readable copy is available in Canada.
- Hiring a bookkeeper or accountant does not shift your responsibility. You remain accountable for your records.
- If the CRA audits you, it can ask for business records (ledgers, invoices, receipts, contracts, bank statements), and sometimes personal records such as bank and credit card statements. You have 30 days to agree or disagree with a proposed reassessment, and you can appeal a reassessment you disagree with.

The exercise I'm working on:
Pick one sale and one expense from last month. For each, write the full trail from source document to the line on your tracking sheet. Note any missing piece and how you will fix it.

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 "Records that stand up to a review" from the course "Self-Employed Tax Concepts: records, deductions and instalments".

Here's what the lesson says:
Think of your records as a trail of breadcrumbs. If someone asks "how did you get this number?", you can walk back along the crumbs from the final number to the receipt, one step at a time. No crumbs, no proof.

The activity:
Pick one sale and one expense from last month. For each, write the full trail from source document to the line on your tracking sheet. Note any missing piece and how you will fix it.

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.