Home Assistant is

an open-source home automation platform to monitor, automate, and control various devices without the Cloud.

Home Assistant has thousands of
components allowing you to connect with your devices.

And a clean Gui if you take time to organise it

Step 1: What You Will Need

You will need:

1.A Raspberry Pi.-https://www.banggood.com/Raspberry-Pi-3-Model-B-ARM-Cortex-A53-CPU-1_2GHz-64-Bit-Quad-Core-1GB-RAM-10-Times-B-p-1041862.html?p=3023136037449201608F

2.A micro SD card at least 8GB-https://www.banggood.com/MIXZA-Shark-Edition-Memory-Card-8GB-Micro-SD-Card-Class10-For-Smartphone-Camera-MP3-p-1058812.html?p=3023136037449201608F

3.Putty to ssh to your pi.-https://www.chiark.greenend.org.uk/~sgtatham/putty/latest.html

4.A computer to ssh to your raspberry pi.

5.A micro SD card reader.https://www.banggood.com/STMAGIC-TC100-USB-2_0-High-Speed-480-Mbps-TF-Card-Micro-SD-Card-Reade-p-1122264.html?p=3023136037449201608F

6.Etcher to burn raspbian-https://github.com/resin-io/etcher/releases/download/v1.1.2/Etcher-Setup-1.1.2-x64.exe

Step 2: Installing Hassio

Download Hassio-https://github.com/home-assistant/hassio-build/releases/download/1.1/resinos-hassio-1.1-raspberrypi3.img.bz2

After you download Hassio and insert your micro SD card then use etcher to burn the image.
(If you don't want to use your pi headless you can skip this step)Make a new file without any extension named ssh in lowercase.

If you want to setup wifi or a static ip edit the resin-sample file in the system-connections folder and follow this steps-https://docs.resin.io/deployment/network/2.0.0/

If Hassio flashed successfully and you have created the ssh file you can plug your SD card into the pi.
(You might have to wait for 30minutes or more for Hassio to get the latest update and set its self up)