I need some help with the word troop.
If I say "100.000 troops", does it mean "100.000 soldiers" or a troop is a group of soldier?
Thank you very much
It means 100,000 soldiers. But you don't call a soldier a troop - it's only used in the plural in that sense. A troop can also be a group of soldiers.
By the way, in English we use a comma (virgola) for 1,000 etc. and a period (punto) for decimals, eg. 2.5 kilos.