Installing Unity

For starting, we have to install the last version of Unity.
To do this, go to https://unity.com and click Get Started

You will be redirected to the sign up page. Switch from Team to Individual and choose Personal, which is completely free and has no difference in terms of features.

Here we choose : completely beginner or some experience with Unity, in any case we are redirect to download page

For example, if click First-Time user, opens a download window,
accept and save.
Now, open the exe and choose personal installation folder.

The process can last long some minutes.
When finishes, run Unity Hub.
This is Unity Hub

From here you can manage your project (as you can see, I already have some project created).
If you go on Learn, there are some usefull beginner resources, same in Comunity, where you can find great answers for your questions or problems.
On Install we see the actual installed versions.

With the Add button we can add the latest version of Unity.

At the time I write this article, I think the 2019.4.15f1 is the best or one of the best version. LTS means Long Term Support, which normally is a better choice respect at the new version.

Hit next, and add some settings.

Android Build Support is for mobile build,
Ios support is good if you have a Mac or a mobile device like iPhone,
same thing fro Linux support.
WebGl Build Support is for Web build and
Window Build Support is a Compiler Optimization.

At the end, agree with the terms and choose done.
The download can take some minutes.

Before finish, the best thing to do is create an ID

You can make it in the Unity Hub or in the Unity main page
https://unity.com