Does the location of main buttons affect usability?

1. Where do I put buttons in UX?
2. Where should back buttons be?
3. Where do I put the help button?

Where do I put buttons in UX?

Full page designs should have the primary button on the left side of the page. If the browser window is large, or you have to scroll down to fill out a form, it's best to have the primary button right below the last bit of content on the page.

Where should back buttons be?

Right: back button above the form (good). Some forms or questionnaires appear across multiple pages and some people want to go back to check or change their answers.

Where do I put the help button?

A help button, link, or icon relating to the whole form or screen function should be located on the top right corner of the screen but below the global header (see Figure 3). Help relating to the entire application or website, such as phone help, support numbers, or global tips, should be placed in the global header.