complete the previous lesson to unlock this one! what i this im new here

Question

i can start

Answer 1

As it saying read lessons and answer quizes in previous lesson. Next lesson will be unlocked then. Continue this till last lesson.
=> to unlock lesson 2 , first complete lesson 1

Answer 2

It means you have to start with the 1st lesson and answer all quiz questions before you can do the subsequent lesson.

Answer 3

roy

It means you can't open any lesson directly without completing previous lesson. For example: A B C

So you cannot open B without completing A

Answer 4

There is no previous lesson?

Answer 5

Hibiki

Lesson before the lesson is known as previous lesson.