How do I properly install Steam on Ubuntu 16.04 LTS? [duplicate]

Just as the title says. I'm pretty new to Ubuntu, but I've used it before about a year ago. I had help then, but now this seems pretty confusing. I've already read the Installing Software article, I'm currently trying to install Steam and when I do:

cd ~/downloads/
sudo dpkg steam_latest.deb

I get a error saying that I need python-apt and I tried doing

sudo apt-get python-apt

but it says invalid operation can you guys list the ways to install an application, and describe it like I'm five? Thanks.

Edit: I'm not talking about using wine in this case, just using the actual package from Valve themselves.

You nearly had it correct, to install steam you need to add the -i flag to dpkg like this:

sudo dpkg -i steam_latest.deb

And if that still fails you can install python-apt this way, which you as well had almost right:

sudo apt-get install python-apt

As you are trying to install Steam, here is a different approach: Install Steam directly from Ubuntu's multiverse repository

sudo add-apt-repository multiverse
sudo apt-get update
sudo apt-get install steam

Reference: https://linuxconfig.org/how-to-install-steam-on-ubuntu-16-04-xenial-xerus