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It actually varies between person. Some may learn backend faster, and vice versa.From my personal standpoint, frontend should be more friendly for beginners.
Frontend development
is the presentation Layer, the part that users interact with. Everything that you see when you are navigating around the Internet, from fonts and colors to dropdown menus and sliders,html, css, and java script.
Backend Development
The Data Access Layer, consists of a server, and application, and a database. A back-end developer builds and maintains the technology that powers those components which, together, enable the user facing side of the website to even exist in the first place.
both persons gave detailed answers. I couldn't say more.