Could somebody explain the space time continuum to me?

I'm vaguely familiar with the concept from an entry level Astronomy course I took last semester. As I was informed, before time was set into motion, the space-time continuum(fabric) was curved upon itself centering with a singularity that contained all of the matter we presently see. I guess I'm confused on how exactly time interacts with space to form this "intergalactic fabric". Also, the idea that "time" can have tangible features(it can ripple, curve etc.) blows my mind.

I'm having a lot of difficulty understanding quantum mechanics and these ideas in general as I've I had only limited exposure to them, In turn, I would greatly appreciate it if someone could clarify the basics of space-time in layman's terms.