These are small steps that can be reused by many of the guides on this website or in your projects.
Amazon Alexa / Echo
Camera
Case
Absolutely Worst Raspberry Pi Case
Certificates
Restrict access to WebServer (certs)
Server and Client-side private certs
Certificates instructable
Database
Display
Install 2.8 Capacitive Touch PiTFT Display
Add 2.8 capacitive touch screen
electronics
Breadboard to Protoboard for run-fan
Fan
microSD Card
Burn image to microSD card with Etcher - DO NOT USE
Music and Audio
Add audio amplifier to FM Radio Receiver
Streaming Radio Station Player
Networking
Operating System
Setup Raspberry Pi 3 B+ with Raspbian
Setup Raspberry Pi with DietPi
Setup Raspberry Pi with Raspberry Pi OS
Upgrade raspbian OS and kernel
Change OSMC from wired to Wi-Fi
Use static IP address on ubuntu
Power Supply
Uninterruptible Power Supply (UPS)
Python
raspbian
Setup Raspberry Pi Zero W (or WH)
Raspberry Pi
Sensors
systemd
Start a service at boot using systemd
Terminal and SSH
iPhone and SSH Terminal
Use MacBook as display (USB FTDI Serial)
Open MacBook terminal and login
VNC (see Raspberry PI Desktop on MacBook)
USB MacBook Display (Bluetooth)
Webserver