我理解得很清楚，这样说更自然

I don't mean to be rude, but it's 讲得很清楚 or 讲的很清楚. "地" is the only wrong option here.

I just added this to HSK 3 lesson 18

it just omitted the 一 before 个

Well, these particles aren't used in actual Cantonese, just in the written official "Cantonese" language, which is modelled on standard written Chinese (i.e Grammar based on Northern Mandarin dialects) even though it's usually pronounced using colloquial Cantonese readings. In fact, 的，得 and地 are probably etymologically the same and the characters used to represent this particle were arbitrarily specialized in one particular grammatical role

I think that this error was computer generated, and overlooked when making the video. The character 得 can also be pronounced as "dé" (which means "to obtain"), as well as "děi" (which means "must" or "have to"). In this video, only "de" (neutral tone) should have been used, since this is the proper pronunciation of 得 as a connecting particle. There is a similar error at 5:05, where 个 should have been marked as "ge" which is the correct pronunciation of this character when used as a measure word. The "gè" pronunciation means "individual".

Yeah I missed that one

@@mountaintag Thank you for this. I was already aware of the other meaning for 个 and of seeing the "gè" pronunciation but have always assumed they are alternative pronunciations since I've seen the measure word 个 used with the 4th tone marker on many other channels as well. This now makes perfect sense. Once again, many thanks and I wish you a Happy New Year.

1 北方人喜欢儿化音，南方人不喜欢儿化音。2 有或没有儿化音都可以。3 不使用儿化音是更文雅的口音。4 没有必要的就不教，这才是更好的课程。