ubuntu beautification guide

I have used ubuntu for a long time, and recently I want to make ubuntu beautify. Just do it.
version:
ubuntu 18.04
gnome-shell : GNOME Shell 3.28.4

Install gnome-tweak-tools

sudo apt install gnome-tweak-tool

Icon Beautification##

First, we must enter a very NB website: https://www.gnome-look.org/
There are countless icons and themes on it. Click to download the icon pack. And unzip it into a folder.

open Directory:

sudo nautilus --browser /usr/share/icons/

Copy the icon file to this directory.
Run gnome-tweak-tool

gnome-tweaks

At this point, you can find the icon model that cp entered just now in tweak-tool.

Theme Beautification##

Choose a theme on the gnome-look website:

Download the theme you like and open the catalog:

sudo nautilus --browser /usr/share/themes/

Copy the theme folder to this directory, use the gnome-tweak tool, you can see the theme you like, just select it.

Cursor beautification##

Find your favorite cursor in gnome-look:

open Directory:

sudo nautilus --browser /usr/share/icons/

Just like beautifying the icon, copy the directory of the cursor file to this directory, and then set the cursor with gnome-tweak.

Install gnome-shell extensions

To achieve this step, one can go further, and that is to install various gnome-shell extensions.
For unknown reasons, after installing the firefox plug-in and background service of gnome-shell, I still cannot install the plug-in of gnome-shell online on the website. Therefore, it can only be installed manually. For specific articles, see: ubuntu manual installation of gnome extensions

Modify the file manager##

Maybe, you want to install another file manager. The following tutorial is to modify the file manager to a deep file manager.
Reference: ubuntu modify default file manager