macOS comes with built-in antivirus protection:

https://eclecticlight.co/2022/11/01/everything-you-need-to-know-about-xprotects-malware-protection/

Yes, but note that you’ll probably need to install extra software to get the scroll/buttons working the way you want. Logitech’s software is garbage, but there are third-party options like Steermouse.

That other port is for Thunderbolt 2:

https://support.apple.com/kb/sp714?locale=en_US

Search for “Thunderbolt 2 to HDMI adapter” for options. Here’s one:

https://www.amazon.com/Plugable-DisplayPort-Supports-displays-3840x2160/dp/B00S0BWR2K

There is no way to tell without having the MacBook in your possession and poking around.

Can you post screenshots of the CPU and Memory tabs in Activity Monitor? And also let us know how much free space you have left on your disk?

I don’t think there’s any need to upgrade now if it’s serving you well. At the very least, you should be good for security updates for another two years.

There are still plenty of advantages to upgrading, of course. Even if you don’t need the extra processing power, the longer battery life could be quite useful.

(And we’re not talking small differences here … modern MacBook Airs offer like 5x the processing power and 3x the battery life.)

Which dock?

You need a Thunderbolt adapter/hub/dock to get two external monitors working. Non-Thunderbolt USB-C docks rely on MST (multi-stream transport) which is not supported by macOS.

There are many Mac apps which are not available through the App Store. You should get them directly from the developer’s website.

Your photo is blurry, but yes, it looks like you cracked your screen.

The only battery health number you should trust is the one reported by macOS.

It sounds like you downloaded a buggy app which some YouTuber was paid to promote.

Yup, I use my laptop ~90% of the time with an external monitor. The macOS “optimized battery charging” feature does a perfectly fine job of keeping my battery at 80% charge.

I know it doesn’t work for everyone, but it works fine for me and I don’t have to worry about the issues that AlDente can cause if you avoid the “IMPORTANT” maintenance step.

Is the WD19S a DisplayLink dock? I don’t see it mentioned on the product page and Dell’s list of their DisplayLink docks doesn’t list it either (only D1000, D3100, D6000, and UD22):

https://www.dell.com/support/kbdoc/en-us/000125234/dell-displaylink-docking-stations-and-macos-support