How can i start learning assamese language??

Cant read or write Assamese language Hi i am from assam and i cant read nor write assamese language and i am thinking of learning it what is the best method to learn assamese for beginner.Btw i can speak fluent assamese nobody can guess that i cant read nor write assamese.I blame the problem as i didnot intent to learn the language when i was in school. Now i regret it so much.Help pls dont judge