Use Crop, Rotate, and Geometry tool in Lightroom

Select the Crop and Expand    icon. 

To resize your photos, do any of the following: 

• Drag the Crop overlay handles to adjust the Crop.
• Select the desired aspect ratio in the Aspect menu. Using the Rotate Aspect Ratio button, rotate the Crop overlay 90 degrees, and unlock the Constrain Aspect Ratio button to adjust the aspect ratio freely.
  
• Hold the spacebar to pan and zoom while cropping a photo. 

Use the Straighten slider to adjust the overall image alignment. Use the Crop Overlay dropdown menu to select from helpful compositional guides.

In the Geometry   panel, do any of the following:

• Select automatic or any manual guided perspective corrections from the Upright dropdown menu.
  
• Select the Auto Upright   icon to automatically correct a photo's perspective or select the Guided Upright    icon to make perspective corrections manually by drawing guides directly on the photo.

In the Geometry panel, use the following sliders to:

• Distortion: Adjust the distortions often caused while capturing the photo
• Projection: Fix stretching near the edges and corners of wide-angle photos, especially in group photos and selfies.
• Vertical: Adjust the vertical perspective, such as straightening or tilting a vertical line.
• Horizontal: Adjust the horizontal lines.
• Rotate: Rotate the photo clockwise or anticlockwise.
• Aspect: Define the aspect ratio of the entire image.
• Scale: Zoom in or out of the image without affecting the aspect ratio.
• X Offset: Move the photo right or left.
• Y Offset: Move the image up or down.

Check the Constrain Crop checkbox to restrict the Crop Overlay to the visible image area.