What is the sharia law on the knowledge of tajweed?

Question
What is the sharia law on the knowledge of tajweed?
Answer
There are different opinions on the ruling of knowledge of tajweed.  Most say that the knowledge of the rules is fardh kifaayah, the differences of opinion come in to the application of tajweed., some say that is fardh 'ayn to apply the rules and others say it depends on ones abilities and intentions.   For a detailed explanation of the different opinions, please see the following PDF:
https://www.abouttajweed.com/Why%20should%20we%20read%20the%20Quran%20tajweed.pdf