Easy Catalan

The series of related language channels EASY ( ..xxx...) is not limited to major languages and national languages. There is also a channel Easy Catalan

Easy Dutch

Easy Dutch is a YouTube channel providing access to the videos published by this language learning site. 

Galego versus Português

Galician versus Portuguese (Galego versus Português).

The channel introduced here is OlaxonMario , the Galician speaker. At the right you recognize Leo of the channel Portuguese with Leo introduced earlier.

What is your English level?

If you are a native speaker, this is irrelevant. In the below test Lucy the series of questions gets progressively harder. 

The Scots language

No not Scottish Gaelic nor Scottish English. Scots is a germanic language in its own right with about 1.6 M speakers, much more than there are people speaking Gaelic.

Langfocus

Langfocus is the Youtube channel I would like to emphasize here. It is a popular channel run by Paul. Many videos focus on one language or a comparison between related languages ... or between different variants of the same language.

A few videos are commenting on 'language families'.