Uni student summer job- how?

[Miljea]

These days, where would a 20 year old uni student go looking for a summer job?

Where do they get advertised?

I know he should set alerts for Tesco, McDonalds etc; but is Indeed useful?

TIA

My DD got a community social care job, ZHC, £10 ph.
Slots are arranged through an app and the user just accepts or declines.

Can be done without a car in built up areas.

Training is online, followed by 2 weeks shadowing & DBS check.

She really enjoys it, not much personal care i.e cleaning up poo! mainly meals and household chores, double ups for lifting and more complex stuff.