Does Anyone Have Tips On Making A Fantasy World And/or World Building For Fantasy?

Does anyone have tips on making a fantasy world and/or world building for fantasy?

I have become much more interested in fantasy lately and just want to know how to make a cohesive world, maybe for a book, maybe just to play around with, i think it would be pretty fun, even if i don't do much with it!

So any tips or tricks in designing a fantasy realm?

I'm starting to think my favorite lactose-free milk is not actually lactose-free. Mainly because i just drank some and now my stomach is acting up :(

it wasn't like this the last time I had it so I'm just really confused right now

Trying to do homework right now but the site won't load so i really can't, I've been trying for like 20 mins and I've decided to just email my teacher and hope she isn't too upset.

Update: only email works, for some reason I'm not allowed to open any documents the only thing I have done in the last 30 or so minutes is send an email, fiddle with the charger, and try open the site again and again but it just won't work :(

Kinda want to do one of those "character questions" things but I'm not sure which oc i should do, any suggestions?

Leigh, but with a noticeable lack of a concealment stone and her hair tied up.

She wears the concealment stone as an earring on her right ear and it is used to cover up the scars from the potions incident, which cover almost both arms entirely.

Juniper, Leigh's best friend will be seen soon but as i have mentioned before, i am terrible at designing fantasy clothes and i don't want to keep putting my TOH ocs in their school uniforms but it should be out some time tomorrow or the day after, depending on my motivation.

Leigh Ferox, She/Her

Juniper Yarrow, She/Xe

(mentioned below)

Fun fact: Leigh is not athletic whatsoever, which creates a tiny bit of confusion because her best friend, Juniper, studies at St. Epiderm and is extremely athletic, mostly taking part in flyer derby ans racing.

Leigh does not actually have a palisman, she refuses to bond with any palismen because she really does want to join the emperor's coven and knows that if she has a palisman it will just get taken away, so there's no point to it in her eyes.

Enphien but with a slightly lighter colours, and in uniform!

Fun fact: Enphien does not have visible ears, like if they were entirely bald you would not see any ears, just semi-hidden ear holes. It is the same for all members of their species