I want to move a person/object to make a better composition

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  Guided > Basics > Move and Scale Object. A powerful feature for selecting, then cutting out part of an image, before moving and pasting it to another part of the picture. The space left by the cutting out action is automatically filled in. This process works really well, especially if the person/object is not too close to the main subject.
• Expert > Select > Subject. Like most auto select features, this works well if the subject is clearly delineated. Elements selects the subject which can then be moved (using the Move Tool) and/or have its size changed (a process called Transformation—see Chapter 6, Advanced Techniques: Transformations, Layers, Masking, and Blend Modes).
  

• Guided > Special Edits > Recompose. Includes a step-by-step demo on how to stretch the background to change or improve the composition.
• Expert > Tool Bar > Recompose Tool. Essentially the same as the...