How to unlock the next lesson?

Question

I have just finished some lessons but I cannot continue because the next lesson is still locking. How do I unlock the lesson?

Answer 1

what if its still locked after completing all prior lessons

Answer 2

firstly you should complete your first lesson then your next lesson is open automatically

Answer 3

there is two ways in which you can unlock the next lesson :
first and best way is to complete the present lesson and get automatically to next lesson.
second way, is the shortcut, click unlock option and unlock the lesson by giving away your XP. this is not suggested.