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.