Free 30-day trial.
$99/year with updates, but you can use the version forever.
Affinity Photo $49 Similar to Photoshop
Affinity Design $49 Similar to Illustrator
Gimp open-source raster graphics editor – Similar to Photoshop
Sketch for Mac a tutorial $99 a proprietary vector graphics editor for Apple’s macOS
Sketch – Look at the CSS Attribute of feature to develop HTML and CSS.
Sketch Plugin – AutoPlugin-How to align center horizontally & vertically.
Squarespace – hosting?
7 Layers of OSI Model and TCP/IP(de facto) from Electronic Design
Tubes: A Journey to the Center of the Internet by Andrew Blum