Clicking the Google search results by default will open them in same window as that of search page. So every time, to open these results in a new tab or a window, right clicking and selecting new window/new tab needs to be done.
Here is how to change it so that all results will automatically open in separate windows on clicking:
Go to Google.com and choose Settings > Search settings.
Scroll down and under the “Where results open” section, enable the tick next to “Open each selected result in a new browser window.”
Hit “Save” for these changes to take effect. From now on, each of the selected results when clicked on will be in a new window.