What size road bike should i ride?

I am 24 years and cycling for one hour daily . I want some guidance regarding the size of a road bike.
Hoping for the suggestions.

 

How about you tell us how tall you are and what your inseam is? Otherwise, you could be a midget or a tall basketball player type, so how can we advise you without knowing the facts about you?

 

Your local bike shop should be able to help you with this question. Also there are bike fitting videos on Youtube. Here's one:

View: https://www.youtube.com/watch?v=vMmbXAWcgh4