Just download and install a Raspbian Buster image as described at Installing operating system images. Don't use NOOBS, instead flash a Rasbian image. Then enable WiFi as described at Setting up a Raspberry Pi headless and all is done. Connect and reconnect to an access point is doing out of the box on a default Raspbian installation.
On my RasPi I see this ...
You can follow this link to find the answer. However, I followed the procedure below on my Raspberry Pi 3B+. It would work for your Raspberry Pi 4B.
Change lines below on /etc/network/interfaces:
iface wlan0 inet manual
iface default inet dhcp
The wpa-roam is the key and allows the wlan0 ...
Are both 64 bit operating systems?
No, arm64 is a 64bit architecture and on the other hand, armhf is a 32bit architecture.
However, you can install one of them and next, install Multiarch to feel free on it.
Multiarch lets you install library packages from multiple
architectures on the same machine. This is useful in various ways, but
the most ...
The answer is unchanged. All Pis use an ARM architecture which is incompatible with the Intel 86 or AMD 64 architectures.
I think you are getting confused by the ARM processor itself being 64 bit and the availability now of 64 bit operating systems for the Pi.
When you run into this problem, just allow your device to complete the first boot. There may be still a background process being busy executing cloud-init and the Ubuntu user hasn't been created yet.
For, just trying again after more wait time fixed the issue.
You can always use ssh if it is enabled on the RasPi, no matter if the RasPi is connected to a TV or not. How to enable ssh look at SSH (Secure Shell) and SSH using Linux or Mac OS. If you want to have a full graphical user interface with windows you can use VNC. How to do it look at VNC (Virtual Network Computing).
Firstly, this question has a more general answer on stackoverflow.
Secondly, I have gotten qt-creator to run on a Pi4 running debian before.
I haven't done any serious development with it, but it works from my limited experience. (it's even in the default repos)