Command Line 2: files, search, pipes and scripts

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I'm learning "Command Line 2: files, search, pipes and scripts" on The Future Market. Lesson 1: "Wildcards: pick many files at once".

What the lesson teaches:
- Before this course: Command Line Basics (course 7.11). There you typed one file name at a time. Wildcards let you match many names with one pattern.
- On Mac and Linux the common wildcards are  (any number of characters, including none), ? (exactly one character) and [ab] or [0-9] (one character from a set or range).
- On Mac and Linux it is the shell, not the program, that expands the pattern, per the Bash manual (it calls this filename or pathname expansion). So ls .txt becomes ls a1.txt a2.txt notes.txt before ls even runs.
- In PowerShell, wildcard matching is done by the cmdlet receiving the pattern, per Microsoft's wildcard help. Get-ChildItem .txt works the same way for you as a user.
- Quotes matter. A file name with a space, such as my file.txt, must be quoted: ls "my file.txt". Without quotes the shell sees two names.
- A wildcard cannot see inside files; it only matches names. Hidden files (names starting with a dot) are normally not matched by  in Bash and zsh.
- Safety: a wildcard multiplies a command. rm .txt deletes every match. Always run ls .txt first to see what the pattern matches, then change ls to the real command, and prefer rm -i or -WhatIf (see course 7.11).

The exercise I'm working on:
In your sandbox, create a1.txt, a2.txt, b1.txt, photo1.jpg and photo2.jpg. Write the pattern that matches (1) only the photos, (2) only a1 and b1, (3) only a1 and a2. Test each with ls and write down the output.

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 "Wildcards: pick many files at once" from the course "Command Line 2: files, search, pipes and scripts".

Here's what the lesson says:
Instead of naming every toy one by one, you can say "all the red ones". A wildcard is a special character that stands for "anything", so one short command can work on lots of files.

The activity:
In your sandbox, create a1.txt, a2.txt, b1.txt, photo1.jpg and photo2.jpg. Write the pattern that matches (1) only the photos, (2) only a1 and b1, (3) only a1 and a2. Test each with ls and write down the output.

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.