How can we sing in high notes?

Yes it is importent

Dear Student, To make voice clean and clear you need to avoid pickles and drinking or eating very cool drinks or food items, Do Gargles with saline warm water regularly every morning, (Mulethi) | Licorice...

Depends on what you are interested in learning. To play an instrument or singing. Indian classical, Carnatic, or Western. You can narrow down your search for a tutor accordingly.

Yes,Without Instruments you cannot learn vocal music.

if a teacher has more than 4 ways to explain you one thing and knows what is passagio , stops you from pushy and throaty singing and if can relate the technique with many styles and genre then he/she can be a good choice.