On the bottom of your screen there (I highlighted it in the above screenshot), it looks like you have a lot of purple (corrupted) ice blocks. A house that has too much corruption (or crimson) close by will become unhabitable.
You should either move the house away from those blocks, or remove them from near your base.
Here, I just made this:
Just what the GIF says, left click and hold to drag the dirt, then let go of the left click to drop the dirt like sand.
Note: If you want the dirt to break, just let go of the left click while your mouse is inside of a tile.
All water evaporates in the Underworld. However, due to the often laggy nature of big bodies of water, sometimes you can glitch a puddle into the Underworld without it evaporating. However, once it settles, if you mine a block from the bottom of that puddle, it will begin to evaporate.
Your options are pretty limited. You can get the Amazon, which is a 20 damage yoyo (compared to the Malaise's 16). It can be crafted from materials found in the jungle. The only other alternative is Code 1, which is randomly sold by the Traveling Merchant (so it's unlikely to show up by the time you progress further).
Every other yoyo requires either ...
This is impossible. Per the wiki, the minimum amount of damage you can do to enemies is 1.
You can see this for yourself by fighting a Dungeon Guardian. They have 9999 defense, which means they reduce incoming damage by ~5000. Even the strongest weapons in the game don't do that much damage, which means that theoretically it cannot be damaged at all. ...
Firstly you should try digging down in the corruption (or use bombs/dynamite) as there should be some alters underground there. However, if you are still unable to find any in the corruption then there will be some scattered throughout your world.
According to the wiki:
Altars encountered outside of the Corruption/Crimson on a given map will always be ...
Demon Altars spawn underground in the corruption (or very rarely thoughout the rest of the world), you won't see any on the surface. Keep checking chasms to see which one will actually lead underground.
If you don't want to explore and hope to find a deeper chasm then you can also dig your way underground. The easiest way would be to use dynamite/bombs to ...
According to the official Terraria wiki:
Golem is a Hardmode, post-Plantera boss found in the Jungle Temple. It can only be fought after Plantera has been defeated in the current world.
So, yes, you need to defeat Plantera first.
You'll also need a Lihzard Power Cell, if you don't have one already:
Golem is summoned by using the ⚷ Open / Activate key ...
No, this will not make the housing invalid. You could completely enclose the Nurse, as long as at least one tile is exposed to join the enclosure to the main room. But one problem you might have, is that placing blocks may change the location the Nurse stands at night, so if you move away from the arena (in order to fight the pillars per say) she may no ...