When you install Ubuntu, which is the easiest of Linux Distros, I do use these commands:

# Update and some cleaning
sudo apt purge -y apport
sudo apt remove -y popularity-contest
sudo apt autoremove -y

# Installing bleachbit and Keepassxc
sudo apt update
sudo apt install bleachbit
sudo snap install keepassxc
sudo apt update
sudo apt upgrade

# Installing ProtonVPN
cd Downloads
wget <https://protonvpn.com/download/protonvpn-stable-release_1.0.0-1_all.deb>

- Open the Files application
- Navigate to "Downloads"
- Right-click the downloaded file
- Choose "Open with Software Install"
- Click the button to install the software

- In Terminal:
sudo apt-get update
sudo apt-get install protonvpn -y
sudo apt install gnome-shell-extension-appindicator gir1.2-appindicator3-0.1 -y
reboot

# Visual settings
settings set org.gnome.desktop.background picture-uri ''
gsettings set org.gnome.desktop.background primary-color 'rgb(66, 81, 100)'

# Installing Virtualbox
sudo apt update
sudo apt install virtualbox virtualbox-ext-pack -y
sudo apt update
sudo apt install -y build-essential dkms gcc make perl
sudo rcvboxadd setup
reboot

For MacOS

/bin/bash -c "$(curl -fsSL <https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh>)"
brew analytics off

brew install taskexplorer
brew install knockknock
brew install little-snitch
brew install oversight
brew install onyx
brew install virtualbox //For newer M1 Macbooks, brew install --cask UTM
brew install carbon-copy-cloner
brew update
brew upgrade
brew cleanup -s
brew autoremove

In the firefox:

In settings:

Disable Enable Picture-in-picture video controls Set home pages to black page Disable all Home Content Set your default search engine to DuckDuckGo and disable the links of others. Disable Provide search suggestions Set Enhanced Tracking Protection to strict Enable Delete cookies and site data when Firefox Disable Ask to save logins and password for websites Disable keeping history Block permissions for location, camera, microphone and notifications Disable Firefox Data Collection and Usa Enable HTTPS-Only Mode in all windows.

Then open about:config

geo.enabled: FALSE browser.safebrowsing.malware.enabled: FALSE dom.battery.enabled: FALSE extensions.pocket.enabled: FALSE browser.newtabpage.activity-stream.section.highlights.includePocket: FALSE browser.newtabpage.activity-stream.feeds.telemetry: FALSE browser.ping-centre.telemetry: FALSE toolkit.telemetry.server: (Delete URL) toolkit.telemetry.enabled: FALSE toolkit.telemetry.unified: FALSE devtools.onboarding.telemetry.logged: FALSE media.autoplay.default: 5 dom.webnotifications.enabled: FALSE webgl.disabled: TRUE network.http.sendRefererHeader: O identity.fxaccounts.enabled: FALSE browser.tabs.crashReporting.sendReport: FALSE pdfjs.enableScripting: FALSE network.dns.disablePrefetch: TRUE network.dns.disablePrefetchFromHTTPS: TRUE network.prefetch-next: FALSE