Studying novel materials or structures often requires understanding the structure in atomic scale as it can provide physical, chemical, and electronic properties of the material. In this talk, I will introduce the capability of scanning transmission electron microscopy (STEM) and mention the recent advances in electron microscopy. In the second part of the talk, the concept of remote epitaxy will be discussed and shown by STEM imaging to understand the remote epitaxial growth mechanism. Lastly, I will share my future research directions by combining STEM with freestanding oxide films.