Yes, Nepal is bordered by Tibet on the north.  You can see that on any map you look at.  I'm including a link to a map that shows it.  I suppose that one thing you should know is that Tibet is not officially a country.  It is officially part of China.  So I guess you could say, if you want, that Nepal is actually bordered by China on the north.

As you can see on the map, Nepal is a very small country.  The map does not really show this, but Nepal is in the Himalaya Mountains.  That is where Mt. Everest is.  The Himalayas lie between Nepal and Tibet.