I am about to build my personal portfolio site, what wireframe tool should I use for design and prototype?
Great question! I have worked at a number of different agencies who have used a number of different wireframing/design tools. If you want a free online tool, check out https://wireframe.cc
My last UX manager used InVision: https://www.invisionapp.com/
If you are looking for native tools, both https://www.sketchapp.com/ and Adobe Illustrator are pretty popular.