The first thing to do when you start using sway is to copy the configuration file, which is normally in /etc/sway/config, into your home directory.
mkdir ~/.config/sway
copy /etc/sway/config ~/.config/sway/
It has some basic settings already set, but you'll probably want to change some of them later.
The basic keybind for running a terminal emulator, which by default is foot, is Super+Enter (Super is the name for what is otherwise called the Windows key or the Command key, depending on your keyboard).
Super+D starts the launcher app (wmenu-run by default).
If you want to change them to something else (i use fuzzel as the launcher), change the variables at the top of the config file and press Super+Shift+C to make sway reload it.
Super+Shift+E is used to exit the session.
As for the top bar that says "1", it displays a list of your workspaces. You can switch between workspaces by pressing Super + the number of that workspace, or move the current window to a new workspace by pressing Super + Shift + number. You can also click on the workspace's label in the bar to move to it, or use the mouse wheel to go to the next/previous one.
The timer at the top right is sway's status bar. By default it shows only the current time, but it's compatible with the i3bar protocol and can show a variety of statuses. Programs like i3blocks, i3status or swayrbar can be set up to display a variety of data in the status bar, or even to create widgets that respond to clicks.
I think this is about uBlock Origin's "advanced mode". If it's activated, then the uBlock addon's pop-up gets an extra table to the left showing kinds of content or domains used and switches to block/allow them globally (on all websites) or locally (on this website specifically). Those switches have two halves, the left side acts as an "allow" button (or rather a "no-op" button that tells uBO to ignore a previous block, but not to unblock something that's detected as an ad by the add-on's regular filters) and the right side as a "block" button.
So, AFAIK, you enable advanced mode, use a global switch to block third-party scripts and you've basically got almost the same kind of blocking NoScript does. As you visit other websites, you can use that table to locally allow some domains in order to un-break a website, block local scripts if you don't trust them either (you could also set that globally to completely match NoScript if you want), or block all third-party content from some domains. It also works in "just a few clicks".