Here is a chart of notes, beats, and rests.
Here is a printable sheet in which to write complete measures in 2/4, 3/4, and 4/4 time signatures. Each line indicated has three sections or “measures”.
2/4 time signature means there is two beats per measure
3/4 time signature means there are three beats per measure
4/4 time signature means there are four beats per measure
Any combination from the above chart is acceptable, providing they add to the correct number of beats indicated by each time signature.