Double-click the .zip file in Finder
Wait for Archive Utility to extract the contents
Find the unzipped folder in the same location as the zip file
Right-click the .zip file and choose Open With > Archive Utility if it does not open automatically
Use Terminal and run `unzip filename.zip` to extract files in the current folder
Use Terminal and run `unzip filename.zip -d destination_folder` to extract files to a specific folder
Install a third-party app like The Unarchiver if the zip file will not open with the default tool