Not sure what to do here

At first I though this was super old wax right around the flange but upon trying to remove it I found it it’s actually metal which has been presumably hammered down. I think the previous toilet did not have a wax seal…. What should I do here? Jumbo wax and call it a day? Use an extender then wax it? The toilet flange is also metal. Building built in 1990; Thanks!

Sink draining slowly

This kitchen sink is draining slowly. Is this elbow to low? That thing sticking up in the back is a vent. This is a relatives house, they're elderly. I'm not handy and wonder if this needs a complete new setup. I want to know what I'm getting into before I call a plumber. Any help is appreciated, thanks!

My landlord locked our hot water

So my landlord installed this lock for the last tenants and can’t get it off anyone know what this is or any advice on how to get it off our plumbing in order to get our hot water back on?

Found out my sewage leads right out to the side of the house, sketchy family friend landlord said a contractor told him to dig a deep hole and fill it with rocks if he doesn’t want to connect it to the city sewage, I have to assume that’s illegal and the way it’s set up right is also illegal

Why does my bidet system add two water lines? I’m trying to exchange the one I inherited for a new one.

Faucet removal question

Complete novice here. My kitchen faucet broke and, this being the first time I've had such a situation, I decided to buy a replacement myself and see if I was up to the task of an installation. After disconnecting the lines and hose from the old faucet, the time came to remove the gasket on the old faucet and this plastic sheath made its presence known. For the life of me, I cannot figure out how to remove it. It seems completely stuck in place. Any advice about what it is and how I could be removed would be greatly appreciated.

What is this white hard puddy?

Whats the technical name of this.

I need to replace this but I can't find it online. Its attached to a spigot on a green roof.

What is this, and how do I get it to work normally?

Need to water our lawn. Just bought the house recently, and this faucet just trickles when I turn it. Why is it doing that? How can I get it to function normally?

Rusted screw removal

Does anyone know how to remove a rusted, broken off screw inside a bathtub overflow plate? I’m hoping to replace the plate but I need to get this screw out first…

How can I take this shit off? I tried everything for two days