Download the latest version of SVN for Windows from the official website: https://tortoisesvn.net/downloads.html

Run the installer and follow the instructions to install SVN on your machine.

After the installation is complete, open a new terminal window and try running the svn command again. It should work now.

Note that if you installed SVN with TortoiseSVN, you'll need to use the TortoiseSVN GUI to checkout the repository rather than the command line. To do this, navigate to the folder where you want to checkout the repository in Windows Explorer, right-click and select SVN Checkout..., then enter the URL of the repository and click OK.

$ svn co https://core.svn.wordpress.org/trunk/ .

bash: svn: command not found