element on WordPress theme

Hi,

I would like to create my own WordPress template in the futur to manage my portfolio easily (instead of changing the code each time) and I would like to know if it’s possible to make the <picture> element working with WordPress?

Is it easier to have multiple picture and add them via the code version of your text or it’s possible to just put a picture and it create other format (resize) automatically for other screen size?

Thank you