Is this car issue really terrible? Please help - I know nothing about cars!

The light doesn't mean there is a leak. It means exactly what it says - "check oil levels". You absolutely shouldn't be driving the car once the light is on. This is basic car maintenance - even I know that and I am a new driver.
You have a car manual which will tell you which oil to use or, as another poster said, you can type your reg into Halfords webiste. The manual will also have instructions on how to check oil levels (and this should have been part of your driving lessons too!). I would strongly consider signing up for a basic car maintenance course in your local college. You really shouldn't be driving without cursory car maintenance knowledge. As a minimum you need to know how to check your consumables, test breaks, tire pressure and power steering.

Also, it being due a service/oil change in a few months has nothing to do with a low oil warning.

Its normal that cars can use/burn off some oil but if it’s disappearing to the point you have warnings then it’s highly likely there’s an issue somewhere, be it a leak or something more costly.

Don’t drive it anymore! If you can’t check it yourself and have AA then call them out.

I work in a service centre. If it’s orange it needs topping up. If it came on on Friday indicating a low level the rest of the oil will not have disappeared by now unless you have a serious leak (you’d have likely seen it under the car). Halfords or your local garage can top up a few litres of oil until your service

Did you not have to do this as part of your test??? I did and I've been driving 20 years

If you've been driving around with no oil since Friday yes that's bad!!

You can check the oil yourself. Pop the bonnet stand it on the stick to keep it up. Get some tissue or cloth. Take the oil dipstick out (will probably have a pic of oil can on) wipe stick on cloth/tissue. Dip again and take the reading. There will be notches on the stick to show you where oil level should be (will leave oil on stick)

If you've still got some oil and it's low drive to nearest garage and top it up.

If no oil at all call AA.

YouTube will show you how to check oil and top up.

Do not check oil when engine has started or is hot

It’s easy to check. Watch some YouTube videos and have a go.

100% do not drive it until you/someone has made sure it has some oil in it, you could destroy your engine.

I'd suggest finding the dipstick and checking the oil level.

Add more if you need it.

No oil means exploding engine so yes it's serious and should be dealt with ASAP.

Don't drive the car until you've put some oil in- available in many places such as petrol stations. Check your owners manual for the specific oil recommended by manufacturer

Needing to top up your oil is part of normal car maintenance, just like checking your tyres. You just need to open your bonnet and find the dipstick and check the oil level. If needed then top it up. You can find out what oil you need using the checker on the Halfords website. The light should then go off.

Have you got a friend who knows about cars that can come round? Guessing not. If not I would def drive it to the nearest garage.

it needs to be checked out but I wouldn’t necessarily believe the ”you absolutely shouldn’t drive it” message

Is the light orange or red?

I'd watch a few youtube videos and see if it was something I could do myself.