Most meters will measure DC volts, AC Volts, DC Current and resistance.
Some will also measure AC Current, but not all.
Then there are the "nice to have" features such as Continuity (a buzzer), Frequency, Diode Test (most resistance ranges wont "turn on" a diode), Hfe (transistor gain), Temperature (with a thermocouple probe).
Read the specifications BEFORE you buy, decide how much you can afford to spend, generally, but not always, the more expensive the meter, the better it is.
JimB