Whether a tip is expected for a ride depends heavily on the country and the type of service. In the US and Canada, rideshare apps and taxi drivers generally expect a tip. In much of Europe and Asia, rounding up or a small amount is more typical, and in several countries no tip at all is expected.
In the US, 15-20% of the fare through the app is standard. In Europe, rounding up to the nearest note or coin is usually enough. Check the country-by-country guide for the specific place you're in, since this varies more than almost any other category.
Rideshare apps like Uber and Lyft prompt for a tip after the ride ends, so you can decide based on how the trip went rather than deciding in advance. For street-hailed taxis paying cash, rounding up to a convenient number is the simplest approach.
This varies a lot by country. For specifics on where you are, check the tipping guide by country.
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