Entertainment Apps 
Spotify 
sudo pacman -S spotifysudo pacman -S spotifycurl -sS https://download.spotify.com/debian/pubkey.gpg | sudo apt-key add -
echo "deb http://repository.spotify.com stable non-free" | sudo tee /etc/apt/sources.list.d/spotify.list
sudo apt update && sudo apt install spotify-clientcurl -sS https://download.spotify.com/debian/pubkey.gpg | sudo apt-key add -
echo "deb http://repository.spotify.com stable non-free" | sudo tee /etc/apt/sources.list.d/spotify.list
sudo apt update && sudo apt install spotify-clientsudo dnf install https://download1.rpmfusion.org/free/fedora/rpmfusion-free-release-$(rpm -E %fedora).noarch.rpm https://download1.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-$(rpm -E %fedora).noarch.rpm
sudo dnf install spotify-clientsudo dnf install https://download1.rpmfusion.org/free/fedora/rpmfusion-free-release-$(rpm -E %fedora).noarch.rpm https://download1.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-$(rpm -E %fedora).noarch.rpm
sudo dnf install spotify-clientcurl -sS https://download.spotify.com/debian/pubkey.gpg | sudo apt-key add -
echo "deb http://repository.spotify.com stable non-free" | sudo tee /etc/apt/sources.list.d/spotify.list
sudo apt update && sudo apt install spotify-clientcurl -sS https://download.spotify.com/debian/pubkey.gpg | sudo apt-key add -
echo "deb http://repository.spotify.com stable non-free" | sudo tee /etc/apt/sources.list.d/spotify.list
sudo apt update && sudo apt install spotify-clientgit clone https://github.com/void-linux/void-packages.git
cd void-packages/srcpkgs/
./xbps-src pkg -j$(nproc) spotify
sudo xbps-install -Rv binpkgs/*/spotify-[0-9]*.x86_64.xbpsgit clone https://github.com/void-linux/void-packages.git
cd void-packages/srcpkgs/
./xbps-src pkg -j$(nproc) spotify
sudo xbps-install -Rv binpkgs/*/spotify-[0-9]*.x86_64.xbpsSpicetify 
To install themes for spotify, you can check this, to install different themes, go here out. If you have troubles going through the steps of spicetify-cli. Here is a script you can use. You need to log in & out after using this.
curl -fsSL https://gist.githubusercontent.com/themagicalmammal/f6f086f9c701924371e1d334c60c8562/raw/d331b26ef430ffa2887172552ce9bbf91df74f3e/spicetify.sh | shcurl -fsSL https://gist.githubusercontent.com/themagicalmammal/f6f086f9c701924371e1d334c60c8562/raw/d331b26ef430ffa2887172552ce9bbf91df74f3e/spicetify.sh | shSpicetify Marketplace 
Marketplace allows you to browse, download, and install extensions, themes, and CSS snippets with ease. You can also browse custom apps, but will need to do some manual installation to get them working. You can install the adblocker directly from marketplace apps.
curl -fsSL https://raw.githubusercontent.com/spicetify/spicetify-marketplace/main/resources/install.sh | shcurl -fsSL https://raw.githubusercontent.com/spicetify/spicetify-marketplace/main/resources/install.sh | shMultimedia Codecs 
Gives you the ability to play popular non-free media formats, including DVD, MP3, Quicktime and Windows Media.
sudo pacman -S gstreamer gst-plugins-base gst-plugins-good gst-plugins-bad gst-plugins-ugly ffmpegsudo pacman -S gstreamer gst-plugins-base gst-plugins-good gst-plugins-bad gst-plugins-ugly ffmpegsudo apt install gstreamer1.0-plugins-base gstreamer1.0-plugins-good gstreamer1.0-plugins-bad gstreamer1.0-plugins-ugly ffmpegsudo apt install gstreamer1.0-plugins-base gstreamer1.0-plugins-good gstreamer1.0-plugins-bad gstreamer1.0-plugins-ugly ffmpegsudo dnf install gstreamer1-plugins-base gstreamer1-plugins-good gstreamer1-plugins-bad-free gstreamer1-plugins-bad-free-extras gstreamer1-plugins-ugly ffmpegsudo dnf install gstreamer1-plugins-base gstreamer1-plugins-good gstreamer1-plugins-bad-free gstreamer1-plugins-bad-free-extras gstreamer1-plugins-ugly ffmpegsudo apt install ubuntu-restricted-extrassudo apt install ubuntu-restricted-extrassudo xbps-install -S gstreamer gst-plugins-base gst-plugins-good gst-plugins-bad gst-plugins-ugly ffmpegsudo xbps-install -S gstreamer gst-plugins-base gst-plugins-good gst-plugins-bad gst-plugins-ugly ffmpegSteam 
sudo pacman -S steamsudo pacman -S steamsudo add-apt-repository multiverse
sudo apt update && sudo apt install steamsudo add-apt-repository multiverse
sudo apt update && sudo apt install steamsudo dnf install steamsudo dnf install steamsudo add-apt-repository multiverse
sudo apt update && sudo apt install steamsudo add-apt-repository multiverse
sudo apt update && sudo apt install steamsudo xbps-install -S steamsudo xbps-install -S steamLutris 
Lutris is an Open Source gaming platform for Linux. It installs and launches games, so you can start playing without the hassle of setting up your games.
sudo pacman -S lutrissudo pacman -S lutrissudo dpkg --add-architecture i386
wget -nc https://dl.winehq.org/wine-builds/winehq.key
sudo apt-key add winehq.key
echo "deb https://dl.winehq.org/wine-builds/debian/ buster main" | sudo tee /etc/apt/sources.list.d/winehq.list
sudo apt update && sudo apt install lutrissudo dpkg --add-architecture i386
wget -nc https://dl.winehq.org/wine-builds/winehq.key
sudo apt-key add winehq.key
echo "deb https://dl.winehq.org/wine-builds/debian/ buster main" | sudo tee /etc/apt/sources.list.d/winehq.list
sudo apt update && sudo apt install lutrissudo dnf config-manager --add-repo https://download.opensuse.org/repositories/Emulators:/Wine:/Fedora/Fedora_34/Emulators:Wine:Fedora.repo
sudo dnf install lutrissudo dnf config-manager --add-repo https://download.opensuse.org/repositories/Emulators:/Wine:/Fedora/Fedora_34/Emulators:Wine:Fedora.repo
sudo dnf install lutrissudo add-apt-repository ppa:lutris-team/lutris
sudo apt update && sudo apt install lutrissudo add-apt-repository ppa:lutris-team/lutris
sudo apt update && sudo apt install lutrissudo xbps-install -S lutrissudo xbps-install -S lutris