It's shared hosting. If you get up to like using 30Gb or so of space, and/or use even around half of the bandwidth you've been given they'll warn you and if you keep doing it they'll probably rid themselves of you, citing the "acceptable use" or "fair usage" policy in their TOS. Almost all hosts oversell nowadays, basically meaning they're selling more than they can practically provide without going bankrupt, with the confidence that basically not everybody who buys the hosting is actually going to use
all of their space or bandwidth.
Either way you shouldn't worry, you'll use alot less bandwidth than you'd think. I've been hosting Entire seasons of Family Guy for all of
GFF, and only so far used about 70Gb (this March which has just finished) out of the 1TB I'm allowed.
Also just in like a word of advice, if you make a site and you type up your content with the typing style you use in your posts, you'll lose like 80% of your visitors straight away. People don't wanna see bad grammar and spelling mistakes on sites.