It is very easy to remove proudly powered by WordPress from twenty seventeen, twenty sixteen and twenty fifteen theme footer.
You don’t need to create a child theme to customize file, You can use the following CSS to hide/remove powered by WordPress twenty seventeen theme.
Login to your WordPress Dashboard, go to Appearance > Customize and select Additional CSS box. Now add following CSS styles and save changes.
.site-info {
display: none;
}
That’s all you need to do to hide Proudly Powered by WordPress link from Twenty Seventeen, Twenty Sixteen, and Twenty Fifteen Theme Footer.