Someone asked and I thought why not share it？

To put it simply:

Very polite:
I would be grateful if you could…
I would appreciate if you could…
Polite:
Could you please…?
Could you…, please?
Polite, but direct:
Could you…?
Would you…?
More direct: Please…

Of course, there many more ways to form an appropriate request in English depending on the context.

But with the above, you should be fine in any situation.