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If the photos you import are taken using a digital camera that embeds camera orientation metadata (portrait or landscape), then Lightroom automatically rotates the image thumbnails in the Library Content area accordingly. If not, then you can click the Rotate buttons or apply the Rotate Left (CCW) or Rotate Right (CW) commands.
Rotate images clockwise or counterclockwise
Timesaver
Shift+click to select multiple adjacent photos; Cmd+click (Mac) or Ctrl+click (Win) to select multiple non-adjacent photos.
Important
Choose Rotate from the Toolbar flyout menu to display the Rotate buttons in the Library toolbar.