Obviously, I know its impossible to completely child-proof a PC, but theoretically, what steps would you take? Assume its a laptop with internet access, meaning you’d want local solutions and something like a pi-hole wouldn’t work well.
I would personally assume, you’d want to:
A) discourage internet exploration by offering ready-to-use options for most needs, such as thumbnails/bookmarks for common websites.
B) Implement some sort of blacklist for common or easy-to-stumble-upon negative content. Maybe something as simple as a Ublock filter?
C) Robust monitoring tools, although I have no idea what.
Edit: To be clear, I know education is the number one tool, but let’s say a tech illiterate friend is asking for help. What might you set up for them, or recommend they use - tools to assist in parenting, not replace it.
It’s also worth adding, if your child comes to you, having fucked up, don’t berate them, they already know. E.g. sent nudes to someone who is now trying to blackmail them. It’s so easy to do, under the pressure, but you must resist.
Instead thank them for coming to you, and let them know you can fix it together, they are not alone. You can discuss what they should have done, and what to do in the future once you’re both thoroughly past emotional reactions to it. Till then you’re in protection mode, not teaching mode.