How to enter Nepal, via road ways or air ways?

If you are travelling through air then you can only enter Nepal through Tribhuvan International Airport; is the only international airport in Nepal that operates several international flights on a daily basis. The airport is located in the capital city: Kathmandu, which is a popular hub for tourists visiting Nepal.

If you are travelling through road ways then you can either enter from China Border and India Boarder but before entering Nepal you should report yourself to Nepal Entry/Exit Points. Some of road entry/exit points are:

From China: Rasuwagadi Border & Kodari Border.

From India: Dhangadi, Kanchanpur, Nepalgunj, Birgunj, Kakarvitta, Bhairahawa

Reference: http://nepalimmigration.gov.np/content/immigration-offices--entry--exit-points-1.html