I don't even know where to start, man... There's so much you'll learn with time.
Few quick tips though
1) Spotlight (cmd+space or the icon next to Siri in the menu bar) is extremely powerful and can find pretty much anything on your system or the web. It can also do maths, conversions and various other neat tricks. I often use Spotlight for converting currencies and finding definitions of words and such.
2) Cmd+shift+3 = screenshot of the entire screen
Cmd+shift+4 = screenshot of a portion of the screen that you use the cursor to mark
Cmd+shift+4 then the spacebar = screenshot of a single app window. When in this mode, just click any window to take a screenshot of it
All screenshots appear on the Desktop
3) Clicking the red "x" in the top left of an open window does not, I repeat, does not quit the application. I've seen many people coming from Windows make this mistake and think their Macs get slow after a while, but they're just filling up their RAM with a hundred apps they neveer quit out of. On macOS an app's window and the app itself are often two separate entities, for good reasons. To quit the whole app, it's cmd+q or you click on the app's name in the menu bar, thne "Quit" (alternatively an option-click (right click in the PC world) on the Dock icon and then quit.
If configured so in the system preferences, if you quit an app without closing its windows, the app will still be quit entirely, but will be exactly like you left it when you open it again.
4) If you ever have any questions or problems you can always PM me on here. Take note that I don't always respond to notifications, but I always do to PMs and I'm happy to help with anything.
5) Since you're coming from Windows you may feel like using Chrome as your web browser - Keep in mind that Safari is a really good option that uses way less power, so I'd at least recommend giving it a nice long trial period before deciding to go back to what you know, if that's what you're planning on. I'm personally not a big fan of the way Chrome renders pages compared to Safari.
6) Start using the trackpad geastures. They're great. Organising yourself with different spaces is brillant, especially with the option to change space with the Trackpad. Right now, I have Safari and iTunes in Space 1, Steam in space 2, and Xcode in space 3. The setup allows easy focus on what you're doing, whilst simultaneously giving easy access to what you might need. I also have an old copy of iStat, namely iStat Pro, in my Dashboard (a feature disabled by default in System Preferences), so I can always swipe all the way to the left for a quick glance at things like how much free space is on my various drives, and how much CPU utilisation the system is at.
7) Cmd+h hides all of an app's contents until you go to the app again. Personally I find this much better than minimising 90% of the time, especially if you quickly want to clear the screen of more than a single window (i.e. 5 Safari windows).
8) If you think the brightness or volume controls are too sensitive, if you hold down option and shift whilst you click them, they'll change in increments of 25% of a normal click.
9) No antivirus software, and no cleaners unless there's a very particular issue you're dealing with. 99% of them are ******** that has no benefits to a normally functioning Mac. If you keep your system reasonably up to date, you don't really need to worry about virusses and all that. This is not to say that Macs are immune to everything - Any computer or digital device can get attacked. But a vast majority of attacks target Windows, and unless you do something stupid yourself, your Mac is super unlikely to get infected by anything, and in those cases, an anti-virus program likely wouldn't help you either. There's good security in the OS as it is.
10) For most apps, when you delete them, it's fine to just throw them in the trash. However, if the app comes with an uninstaller or the developer has instructions for uninstalling, always use the uninstaller or follow the instructions or you'll be left with a lot of residual files after throwing the .app bundle in the trash. All this can of course be cleaned up regardless, but it's a more annoying process than it needs to be.