I wish eclipse can occur more often
Me too. It's a pretty cool thing to see an astronomical object obscured by a shadow or another body.
Do you think there are categories of Eclipse that occurs?
There are eclipses that are an occultation, which means they are completely hidden, and there are partially hidden eclipses called transits
What are the measure one should take before viewing an Eclipse?
It would really depend if it were a solar or lunar eclipse. But the alignment of 3 objects is actually called a syzygy.
When did the first Eclipse occur? or has it been happening since the existence of earth?
Oh for sure. Solar and lunar eclipses have been happening for as long as earth has existed.
What benefit does an eclipse have for earth?
I think the only benefit is that it looks really cool. Especially total eclipses where the sun is fully obscured by the moon