Always layer multiple of these so that a monster with for example 3/day dispel magic can't get through.

If cast in a too small space does it fizzle?

Can an ally attack from within the hut when an enemy is right beside that ally/attacker?

I went through the 1st page but thought to ask before I continued to read on.

I'm trying Bard for the 1st time & want to be as useful as possible.

 Jeremy Crawford is wrong as far as I'm concerned. It's a "dome of force" that allows certain things in, but not foreign objects, or even liquids such as rain, or temperature.
So it's not magic, it's not an attack, it's not an object, and it's not weather so it can pass? No. Acid can't get it because it's dry inside, fire (basically hot gas) can't get inside because it'll cool off instantly as it does, only comfortable breathable air passes through. Maybe poison gas but that's it.
Letting dragon breath pass through because it's technically not magical, an object, or weather is silly and frankly thinking like a robot.

So theoretically while this spell says it can't be moved, and that only designated creatures can enter, can the floor/ground be compromised causing the people within to plummet to outside of the dome's protective area?

Say for example, someone cast TH on a rope bridge and someone responded by cutting the rope bridge. As the spell says nothing about the hut's floor being solid, only that the person can pass through it freely, would the people inside fall alongside the rope bridge?

And thus, could you interfere with the people inside by digging under the spell to cause them to drop into sinkholes/ect. Or by collapsing surroundings onto the hut to trap people inside?

I just had a session where my Scribes wizard was cheesing his Awakened Spellbook ability to be able to cast this as an action in combat, thus stopping him from getting attacked while letting his party run in and out to prevent getting attacked.  When I noticed that it says the AS Ability says that you can cast a ritual as a normal spell ONCE per long rest at the normal casting time, and I noticed it also says that creatures within the 10ft dome when cast are able to go in and out of the dome, I realized he was trying trying to pull one over on me.  The party was swarmed by centipedes and he used the Hut to like push all the centipedes off him and his party when they ran inside the hut.

Where do you poop if you can't leave the hut?

I'd assume that you'd have to do your business inside the hut. It's kind of awkward, but this is realistically what it would include. Additionally, you could do your business into a bag and ask one of the people inside the hut to leave the hut and throw the bag somewhere, which is also pretty awkward.

Your best bet is to go before you cast the spell, as you won't have to deal with the smell and going #2 in front of your friends.

EDIT: I guess you could, hypothetically, cast Unseen Servant before casting Tiny Hut and then have your Servant ferry the bag out. But, Unseen Servant must be cast prior to casting Tiny Hut, as the Tiny Hut spell's description bars any creature that was not inside the Hut when it was initially casted from leaving. So, that is still a lot of prep when you could just use the bathroom before summoning the Hut.

Quote from AlexanderDemosword >>

I'd assume that you'd have to do your business inside the hut. It's kind of awkward, but this is realistically what it would include. Additionally, you could do your business into a bag and ask one of the people inside the hut to leave the hut and throw the bag somewhere, which is also pretty awkward.

Your best bet is to go before you cast the spell, as you won't have to deal with the smell and going #2 in front of your friends.

EDIT: I guess you could, hypothetically, cast Unseen Servant before casting Tiny Hut and then have your Servant ferry the bag out. But, Unseen Servant must be cast prior to casting Tiny Hut, as the Tiny Hut spell's description bars any creature that was not inside the Hut when it was initially casted from leaving. So, that is still a lot of prep when you could just use the bathroom before summoning the Hut.

You can't leave the hut without the spell ending, but objects that were inside when the spell was cast can pass through it freely, so you can just throw the bag out of the hut yourself. No need to inflict it on anyone else.

As the only Arcane caster who could actually build a functional hut, I think this should be on my spell list.

-ARTIFICER

RAW: Simple, just dig.

Hence... Matthew 7:24
>_<

Quote from Dinozzo_Designs >>

Where do you poop if you can't leave the hut?

 thats what that one bag of holding is used for......lol.  Just make sure that bag is clearly marked, you don't want to go to grab that healing potion and grab that crusty turd instead.