Click on the Steam download button. Once you click it, select your platform and download it.
When the download is complete, launch the installer. It will open Steam installation first step and click on the next.
Now you have to select your language. Now Steam has over 28 languages and will be adding more. And click on the next.
Once you click it, Steam will ask which folder to install Steam. And select your folder and click on install to start the installation
When the installation is complete, click on Finish.
When you click on the Finish, it will automatically download and update the rest of the Steam files. This will take a few seconds to download.
When the installation is complete, fill the Steam account name and password to log in to your Steam account. However, if this is your first time, click on the create a new account to create a Steam account.