Rapid Prototyping and preparing graphical interfaces for proper handoff to developers is an ever-changing, platform-specific world of web and mobile devices. Knowing how to create and deliver designs that a user can interact with, without getting confused or disinterested, is essential to a brand's message success. Tools like Sketch, XD, Atom, SVGito and Zeplin are only a few of my latest favorites that help designs comply with iOS/Android/Etc. and take the hand-off to a cleaner faster experience than the old school of just Photoshop layers and laboring over a manually created style guide. It is also essential these days to optimize the design and code format of SVG vector and compression of bitmap graphics to work in scale, pixel-perfect on all platforms. It is a never-ending learning experience and keeping up with new technologies is a must.