Where to put buttons on forms

Excellent article by Adam Silver: Where to put buttons on forms. Quick notes:

• Align the primary button to the left edge of the inputs
• Put the back button above the form
• Put tangentially related actions above the form (like: forgot password in a login form)
• Place extra buttons based on what they do
• Put the cancel button below the primary button
• Put the add another button above the primary button
• Put the save and exit button next to the primary button
• In single field forms put the button next to the input
• Put buttons on multi-select forms above the form