This will delete all your data, including channels, videos, comments and you won't be able to create another user on this instance with "<x id="PH" equiv-text="this.user.username"/>" username.
A channel is an entity in which you upload your videos. Creating several of them helps you to organize and separate your content.<x id="LINE_BREAK" ctype="lb" equiv-text="<br/>"/> For example, you could decide to have a channel to publish your piano concerts, and another channel in which you publish your videos talking about ecology.
We couldn't find any <x id="INTERPOLATION" equiv-text="{{ getRessourceName() }}"/> tied to the URL <x id="INTERPOLATION_1" equiv-text="{{ pathname }}"/> you were looking for.