Where to place the Save button Material

1. Where do I put the Save button?
2. Should save button be on top or bottom?
3. Where do you put the floating action button?

Where do I put the Save button?

Right: 'save and exit' button next to the primary button (good). Sometimes users might need to save their progress on a long form. Putting the 'save and exit' button above the primary button implies it's more important, when it isn't.

Should save button be on top or bottom?

Considering that your users will typically navigate to one category, make a change, then click Save Changes, I think placing the button at the bottom/left is best. If your users were frequently making changes across multiple categories, then you'd have a good argument for placing the button at the top.

Where do you put the floating action button?

The button should be placed in the bottom right corner of the screen. The recommended margin for the bottom is 16dp for phones and 24dp for tablets. In the example above, 16dp was used.