It may be a simple question but I am not sure how to play the attached measures.
The left hand plays C for 4 beats, the right hand after 2 beats should also play the same C note, but the left hand is still pressing the C.
Something similar occurs in the third measure. I highlighted the problem notes here: 
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Any explanation will be helpful. Please keep in mind that I am beginner
Thank you
It's reasonable that you can't hold a note and play it again, so you hold as long as you can, then play it again. But, since it's feasible to pedal each bar, as a particular chord lasts a whole bar, using pedal, it can all work.
In bar 3: The left hand plays the chord, with your left thumb playing the B.
Just before the second beat of the bar, you lift your left thumb, and play the same B with your right hand on beat 2, 3, and 4.
Similar thing in bar 1: When it's time to play the C with the right hand, lift the left hand finger from the same C note.
To do this with pedals, you'd need a piano with 3 pedals, while the simple nature of this tune suggests (imho) that the simple approach I suggested above is implied.