Evernote can be used to organize one's life by collecting information from various sources and easily finding what you need through searching. There are different levels of organization - from dumping everything in one notebook with no tags (Level One), to creating multiple notebooks and tags (Level Two), to having a complex customized system (Level Three). Key aspects include adding content, searching within notes, using notebooks and tags, and sharing notes. Evernote allows for flexible organization and access to information across devices.