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@wise_Lightning800 you can edit text in a PDF by selecting the Edit PDF tool. This tool allows you to manipulate existing text boxes, add new ones, and change formatting. Now, you can click on a block of text to select its bounding box. (https://www.adobe.com/ca/acrobat/how-to/pdf-editor-pdf-files.html) You can then click and drag the box to a new location on the page. Use the alignment guides that appear to help with positioning. When you select a text block, a Format panel will appear on the right side of the screen. This panel displays the font and size of the selected text. You can select new text you've added and use this panel to adjust its font and size to match the surrounding content. https://www.adobe.com/acrobat/hub/change-font-size-in-pdf.html

For your second question, scanned PDFs are essentially images of documents. Scan them straight and flat if possible.