Question

Is it fardh to learn tajweed, if so is it important to learn it before puberty.  And is there any evidence to say that it is fardh if so what is it?

Answer

As-salaam alaikum.  The issue of tajweed and the level of importance placed on it by different scholars is discussed at length in a PDF download that you can read at this link:

http://www.abouttajweed.com/Why%20should%20we%20read%20the%20Quran%20tajweed.pdf