Advice about fruit for russian dwarf

[Hoopy]

Hi there, I'm picking up my first ever hamster next weekend, a winter white russian dwarf. Not my first rodent but my first hamster. I've been looking into the right fresh food to give them and I've been mostly getting consistent answers about vegetables but really inconsistent answers about fruit.

One website said to give them apples and grapes, another said yes apples but no to grapes, another said no fruit at all because of the sugar. So I'm really not sure and I don't want to get it wrong.

Any advise would be appreciated, thanks!