I wouldn’t start with strawberries, they’re disappointing mofos IMO.

Building on Catfish’s other comment, I recommend growing dwarf snow peas from seed. High germination rate, not that many pests/diseases, don’t take up much space, not that picky (just keep it well watered), will twine even on a couple of sticks, enjoys part shade, long growing season (so easy to just keep sowing every 6-8 weeks for a continuous crop), usually prolific and quick to fruit - plus you can eat the shoots as well as the pods :)

They’re a popular choice for kids. Legumes are generally fun. When I was a kid, it was mung beans in a plastic paper cup.

And don’t take it too hard if you kill a plant, EVERYONE has done it regardless of skill level or experience - I have a graveyard of dead houseplants I still haven’t tidied up… Just keep going and you’ll start accumulating successes that you can build on :)

E: I also heartily recommend starting with pots. Just easier to control and manage and a lower rate of encountering insects (usually).