For learning Dzongkha language it is necessary to know alphabets in Dzongkha. You have to know alphabets in Dzongkha to learn writing in Dzongkha language. Dzongkha alphabets are the building blocks of Dzongkha language. There are 95 characters in Dzongkha alphabets. Dzongkha alphabets are made up of Dzongkha vowels and Dzongkha consonants. The Dzongkha alphabets contain 5 vowels and 30 consonants. Dzongkha vs German gives a comparison between Dzongkha and German alphabets.
Dzongkha script is also known as Dzongkha writing system or Dzongkha orthography. The set of visible signs used to represent units of Dzongkha language in a systematic way is called Dzongkha Script. The Dzongkha language uses Dzongkha Braille, Tibetan Braille i.e. Dzongkha alphabets are derived from Dzongkha Braille, Tibetan Braille script. The script decides the writing direction of the any language, hence the writing direction of Dzongkha is Not Available. Learn Dzongkha Greetings where you will find some interesting phrases.
Is Dzongkha hard to learn? The answer to this question is that it depends on one's native language. One should start learning Dzongkha language with Dzongkha alphabets and Dzongkha phonology.
Time taken to learn any language that is mentioned here is the approximate time required to learn specific language for the person who is proficient in English. You can also go through all Indian Languages and find if Dzongkha is one of the language of India.