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A lot of YouTube and Indestructibles will probably be over built for your needs.
My initial thoughts would be to source a wooden kitchen work surface, either 2nd hand or ebay and then screw it onto a frame made to fit the space, then all screwed into the wall.
The forces of a toddler pulling it away from the wall won't be that great as long as it's supported underneath properly.
https://m2.ikea.com/us/en/p/karlby-countertop-walnut-50335208/
Any good resources for doing a simple workbench? I want a desk for a small space but it needs to be sturdy so figure something solid like a workbench would be more reliable and toddler-proof (no such thing I'm well aware).
It's to fit on a tiled floor next to three concrete steps so don't want it pulled down. I could drill into the wall I guess.