Embed StencilJS webcomponent

Questions
1

Hello everyone.
I built some webcomponents using stenciljs, but I realized that if I use them inside internal events don’t work and if I use document.querySelector inside the component I always get null.
Given that the webcomponents I created work perfectly in a normal html page.

Is there a particular method that I have to use to import webcomponents?

2

You need to share more code on what doesn’t work, what is in web component. It is not clear at all what is the issue