I suggest a Thai languages Codidact

I am a student of common Thai language for nearly a year.

I understand that common Thai language is about at least 75% similar to other Tai Kra-Dai languages such as Lao; let along, the writing systems are very similar and I can read a bit of Lao even though I never studied Lao for a moment.

I understand that Thai language (including Lao language, Isan-Thai language) share pretty much the same tonation system as well as the same Khmer-Thai diacritics system.

I understand that Thai and Khmer share many words (the similarity between Thai and Khmer is by itself a very interesting topic IMO); for example:

| English     | Thai             | Khmer            |
| ----------- | ---------------- | ---------------- |
| I           | กู (gu)           | ខ្ញុំ (khiom)       | 
| Want        | ต้องการ (tonggan) | ចង់បាន (changban) |
| This        | นี้ (n^i)          | នេះ (ni)         |
| Food        | อาหาร (ahan)     | អាហារ (ahe'n)    |
| For         | สำหรับ (samhrab)  | សម្រាប់ (samrheb)  |
| Her         | เธอ (t-ee-o')    | នាង (n-ee-o)     |

_{In modern Thai กู (gu) is archaic and ฉัน (chan)/ผม (phom) are used for woman/man respectively.}

The site could be handy for many expats, tourists, and linguistics amateurs who want to learn focal data about Tai Kra-Dai languages.