When we buy stocks in foreign currency (foreign to your home currency), then there will be a risk of losing or profiting from changes in the foreign exchange between the two currencies.
I generally don’t care because -
Invest for the company’s growth and it should overtake the currency effect (certain exemptions apply).
Many companies have a global agenda, so the FX impact of the underlying stock currency would be mitigated by their income profile.
Your home currency (the one you spend daily on), has a greater impact than individual stocks currency.
Note: Point 3 requires a full post on its own, at some point. In a nutshell, if you live in a country that has a weak currency (relative to global purchasing power), then you may need to invest with that in mind.