Fondsites is published by TensorSpace, Inc. and built as a network of practical topic libraries for people who love learning deeply and casually at the same time. Across more than 500 guidebooks, each Fondsite takes a subject that is easy to enjoy and hard to master, then treats it with the respect it deserves: clear writing, careful organization, and guidebooks that make curiosity stick.
Fondsites is edited and published by JJ Ben-Joseph , founder of TensorSpace. His background spans software, AI, startup work, and national-security-adjacent technical programs, and that bias shows up throughout the site: practical explanations, clean structure, and a preference for useful specificity over content filler.
If you’re brand new, you’ll find clean on-ramps and practical explanations. If you already know the vocabulary, you’ll find structure: the kind that turns scattered knowledge into a system you can use in the store, at the table, or in conversation.
Across the network you will see the same philosophy expressed in different flavors. We publish guidebooks that teach you how to think, not what to buy. Each guide is designed to be practical in the moment and easy to revisit later, whether the topic is a kitchen habit, a piece of gear, a field skill, or a future system.
Today, Fondsites spans two dozen topic libraries, from AI agents, robotics, future energy, space infrastructure, and synthetic biology to food, drink, watches, rings, fragrance, Jewish life, Krav Maga, sleep setup, home energy, tiny homes, keyboards, and more. You can jump in anywhere; if you want a gentle start, open any site and follow its Quickstart guidebook or play the guidebook game.
Questions, suggestions, or sharp-eyed corrections are always welcome. When you’re ready, reach out via the contact page .