I keep track of all my projects using task management apps like Asana, use Git to backtrack what I have been doing on each project, and switch projects really often. This way I can make sure I am organized and can pick up where I left off and if I am at a roadblock with one project I can blow off steam by doing something really great on another.

Another helpful thing is to use code linters to prevent simple typos and other easy-to-miss errors. Atom editor, for example, has tons of linter plug-ins, as well as other helpful things, to ease creating code.