The term tajwīd is derived from the triliteral root j-w-d, meaning enhancement or to make something excellent. Technically, it means giving every letter its right in reciting the Qur'an.In Islam its duty of Muslims that at least one person in every community must know it.
Qari Muhammad Akhlaq Madni is a renowned teacher of Tajweed of Quran and has been Muezzin of Faisal Masjid Islamabad.These programs recorded with him, to guide beginners. A very comprehensive article is here to know more:
https://en.wikipedia.org/wiki/Tajwid
Riphah Radio blog https://www.riphahfm.com/