https://www.howtostudycantonese.com/cantonese-romanization-systems-yale-romanization-of-cantonese-and-jyutping/#:~:text=What%20is%20the%20difference%20between,cannot%20be%20expressed%20by%20Yale.
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What is the difference between Yale romanization of Cantonese and Jyutping?
Yale and Jyutping is largely similar, differing in their notation of tones and about 19% of the consonants and vowels. Nevertheless, Jyutping is much more detailed, as it denotes vowels cannot be expressed by Yale.
Therefore, if you start off by learning in Yale, in some point of your study, you will come across words that cannot be romanized. By then you will have to switch to Jyutping and adopt a new romanization system.
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最重要就係yale係拼唔到粵拼嘅eu, em, en, ep, et, 嗰下先攞命
e.g. 掉 deu6
舐 lem2
send sen1
嗒 dep1
溼坺坺 sap1 pet6 pet6 個「坺」字