CoffeeCake

You just made the thing up, so I don't think IPS has a definition for this. What's your definition? It's been a while since the nightmares surrounding what became of vBulletin stopped waking me up in cold sweats, but I think you may be referring to the number of members that are registered (the big number) and the number of members that have an active session, or are "online" right now (the smaller number).
If that's the case, you can add an online visitors block and a statistics block that will do this same thing. Log in as an administrator, click the little plus sign on the left, find and add your blocks away. I'm sorry but I don't remember what the block or blocks are called, but it's in there somewhere.
If you're wanting to move people into a group based on some conditions, the feature you're looking for is Group Promotions. The documentation for that lives here:
 

ACP > System > Support > Pick the radio button that says "Something isn't working correctly" (unless you've translated this phrase to "It's them, not you.") > Press the button to submit.

ACP > System > Support > Pick the radio button that says "Something isn't working correctly" (unless you've translated this phrase to "It's them, not you.") > Press the button to submit.

(...or the support request module in Commerce...)

(...or the support request module in Commerce...)

Is mod_rewrite (assuming apache) enabled on your web server, and is your web server configured to allow mod_rewrite rules via .htaccess?

See DISABLE_MFA

See DISABLE_MFA

Yes, there are coupon codes in Commerce.
Here is the documentation for gift cards:
 

/redeem is for gift card redemption (by default at /store/redeem). You can issue a gift card, which is not a license key. That gift card can then be used for a fixed dollar amount purchase, just as you might use a gift card for $20 for a typical store.
You can look into changing the fURL if needed.
As an example, here's the address on here: https://invisioncommunity.com/store/redeem

Not really. There's a significant learning curve for some, and it would be nice to have a guided onboarding flow.
You may have seen some tools that highlight areas of the interface and help a new person understand the basics of a service, site, or product.
None of that exists here but would be a welcome thing.
You could use the Pages application to create illustrated guides, or to embed an introductory video from YouTube, but you'd be creating these yourself.

I went to your web site. I had a fight with the thing angry at me that I had an adblocker. Lied and told it I disabled it. It sensed my deceit.
Then I clicked to find a forum post--any forum post. Found one. Conservatorship. Clicked on a topic, and then had a fight with your web site telling me I've had my fill of free content for the day and inviting me to register. While a video played. In the corner. And there were flashing lights.
I tried. 🙂
It should add, in the locations Gabriel Torres mentioned here a loading="lazy" attribute to reaction images, reputation images, and avatars. But, I'm not sure how/if it would work with the custom theme you have installed. There will be nothing visually different, however if you inspect the img tags for those locations, you should see loading="lazy" added, as shown below:
<img src="/path/to/avatar.jpg" loading="lazy">  

This is a lovely feature request. May it one day appear on the radar of things.
Let's also throw in "Recent Visitors Block" -- that should be configurable as well. Maybe creepy stalkers aren't a thing in other places.
Well, however, you can control some of this. You'd need to control viewing permissions of the database level. If you want someone to be able to see businesses in general, they'll see it on profiles. If a usergroup can't see businesses at all, then it won't show anywhere.

I went to your web site. I had a fight with the thing angry at me that I had an adblocker. Lied and told it I disabled it. It sensed my deceit.
Then I clicked to find a forum post--any forum post. Found one. Conservatorship. Clicked on a topic, and then had a fight with your web site telling me I've had my fill of free content for the day and inviting me to register. While a video played. In the corner. And there were flashing lights.
I tried. 🙂
It should add, in the locations Gabriel Torres mentioned here a loading="lazy" attribute to reaction images, reputation images, and avatars. But, I'm not sure how/if it would work with the custom theme you have installed. There will be nothing visually different, however if you inspect the img tags for those locations, you should see loading="lazy" added, as shown below:
<img src="/path/to/avatar.jpg" loading="lazy">  

Oh, so a process where you select a number of files and then make one purchase for all the things in your cart. That's surprisingly not a thing?

Not a Downloads customer, but that's a weird UX oversight.

One day, future time traveler, 4.6 will appear. Until that day, here's a plugin that does what @Gabriel Torres documented for you for 4.5.
 
Lazy Load Images.xml
Submitted to Marketplace as a free resource for those that like the Marketplace thing:
 

No idea how it will work with a third-party theme. It's simple theme hooks based on the default theme, and simply adds the loading="lazy" attribute to <img> tags as @Gabriel Torres documented.

One day, future time traveler, 4.6 will appear. Until that day, here's a plugin that does what @Gabriel Torres documented for you for 4.5.
 
Lazy Load Images.xml
Submitted to Marketplace as a free resource for those that like the Marketplace thing:
 

One day, future time traveler, 4.6 will appear. Until that day, here's a plugin that does what @Gabriel Torres documented for you for 4.5.
 
Lazy Load Images.xml
Submitted to Marketplace as a free resource for those that like the Marketplace thing:
 

One day, future time traveler, 4.6 will appear. Until that day, here's a plugin that does what @Gabriel Torres documented for you for 4.5.
 
Lazy Load Images.xml
Submitted to Marketplace as a free resource for those that like the Marketplace thing:
 

One day, future time traveler, 4.6 will appear. Until that day, here's a plugin that does what @Gabriel Torres documented for you for 4.5.
 
Lazy Load Images.xml
Submitted to Marketplace as a free resource for those that like the Marketplace thing:
 

One day, future time traveler, 4.6 will appear. Until that day, here's a plugin that does what @Gabriel Torres documented for you for 4.5.
 
Lazy Load Images.xml
Submitted to Marketplace as a free resource for those that like the Marketplace thing:
 

One day, future time traveler, 4.6 will appear. Until that day, here's a plugin that does what @Gabriel Torres documented for you for 4.5.
 
Lazy Load Images.xml
Submitted to Marketplace as a free resource for those that like the Marketplace thing: