Using Illustrator's erasing tool does not work on text and graphics in their native, editable form. To erase parts of the text, you need to convert the text to an outline, for which the eraser tool ...

I walk through how I use Adobe Illustrator on my iPad to start a new project, make shapes, and use the tools that help me ...

In Illustrator, the envelope works like a mask, it hides the parts of the object that is outside the envelope. It goes further by changing the shape of the object to fit the shape of the envelope.