Learn 101: Learn Languages
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"I would like to welcome you to the Cantonese lessons. I'm here to help you (bold)learn Cantonese(/bold)". Hello there, content-farm-robot-pretending-to-be-a-person.
Lesson 1: "Cantonese Alphabet". There is no alphabet in Cantonese, it's a Chinese language. Click.
"Today I will teach you the (bold)Cantonese alphabet(/bold). If (...more filler...). Cantonese contains more than 9900 letters". Hu, OK, let's stop here for the 'alphabet'. A quick look at the other 'lessons' shows what is obviously missing but would be in any true '101' Cantonese course: it's a tonal language, so you'd have to explain the tones first.
If you skim through multiple languages you will see a 'Translation' service (with a paid option, but it's the same page as the free one) that always point to the same (stock photo) translator. Not sure what that website is for, but it's not for learning any language.
Since there is not a lot of learning material for it online, I find Cantonese to be a good 'BS-meter' for language websites (in that it's not too hard to see if they got the basics wrong or not).
Re Cantonese:
There are numerous mistakes - the romanizations don't always correspond to the Chinese characters, and many of the phrases are Mandarin idiom, which is different from Cantonese. So I can't recommend it.
I think it's Jyutping romanization. I wish it did use Yale, which I prefer, mainly because of how the tones are represented. Cantonese has several competing romanizations.
This site's better: http://www.cantonese.sheik.co.uk/
คน - Man - should be ผู้ชาย
มารดา/บิดา - Mother/Father - way too formal - should be แม่/พ่อ
Be very skeptical of language sites that have tons of languages from different families. You're better off on speciality sites/subreddits.
http://learn101.org/marathi_alphabet.php
This is not the Marathi alphabet. It's the Telugu alphabet.
I looked at the Kannada page in some more detail. Good news is that the phrases are in fact in Kannada (unlike the alphabet). But even here some of the translations are slightly off. The one for "he visits many countries" uses "urugalu" (places/towns) instead of "deshagalu" (countries).
I don't get the impression that this is a reliable site.
"Japanese contains 26 letters (consonants and vowels)."
Then goes on with a table of 48 characters representing syllables. (including the 2 very rarely used ゐ(wi) and ゑ(we)). They happily skip the part where there are 2 such syllabary systems, plus the Chinese characters.
Then there are pages about "Japanese Plural" and "Japanese Gender" (Japanese doesn't have such things), and one about "Japanese Numbers" not explaining a thing about counter words.
This all looks like templated information that is the same for all languages. You're apparently expected to just translate from English word for word and hope for the best.
Edit: Oh, and it's funny that they only introduce hiragana, but also use katakana and kanjis for all words and example phrases.
Perhaps this is a curmudgeonly and pedantic observation, but linguists be linguists.