Once you have seen my A0 lessons on pronunciation and sounds, you may also find these videos and tools helpful:
Video from The Wild Amalia: Top 3 Basic Tibetan Pronunciation Errors https://youtu.be/yRcE9UVmqAs?si=82MMwihDWyUgZjoaÂ
Pronunciation Helper App by Andrew Hughes (Beta): pronunciation-helper (bum-pa-mi-rtag-pa.site