Website not showing details full width

Hi my website link is: https://www.psfcorporation.com
and I would like to make content to be available on a larger horizontal canvas? (if that makes any sense)
Currently the website only allows me to put content into the middle, I would say 70% of the page, whereas I would like to insert content taking up around 80% or 85% of the page horizontally.

What can I do to fix this?
Also, when I try to embed videos from youtube, they don’t seem to let me embed two videos that are larger than 300pxx300px videos beside each other. It feels like there is white padding that I can’t see that’s taking up the space. Is there a way to deal with this?

Thanks so much