Image credits
Photos in these guides come from Wikimedia Commons under free licences (Creative Commons or public domain). Each is credited here and under the image. Illustrated cards without a credit are original graphics made for this site.
Image: RFkey.jpg by Kavya Manohar, CC BY-SA 4.0, via Wikimedia Commons
Image: Datove_centrum_TCP.jpg by Eclipse55, CC BY-SA 4.0, via Wikimedia Commons
Image: Brain-virus.jpg by Avinash Meetoo - avinash@noulakaz.net - http://www.noulakaz.net/ - Avinashm a..., CC BY 2.5, via Wikimedia Commons
Image: QR_code_for_mobile_English_Wikipedia.svg by Brdall, Public domain, via Wikimedia Commons
Image: Wikipedia_homepage_on_a_large_Android_phone,_2015-04-16.jpg by Sage Ross, CC BY-SA 4.0, via Wikimedia Commons
Image: ST3320620AS.jpg by User5515, CC0, via Wikimedia Commons
Image: Laptop-hard-drive-exposed.jpg by Evan-Amos, CC BY-SA 3.0, via Wikimedia Commons
Image: Tank Farm GA - Jan2014 (26908194378).jpg by formulanone from Huntsville, United States, CC BY-SA 2.0, via Wikimedia Commons
Image: SIM-Karte_von_Telefónica_O2_Europe_-_Standard_und_Micro.jpg by Telefónica O₂ Europe Scan by User:Mattes, Public domain, via Wikimedia Commons
Image: Black smartphone in hand (Unsplash).jpg by Dennis Cortés cortes, CC0, via Wikimedia Commons
Image: Network switches.jpg by ShakataGaNai, CC BY-SA 3.0, via Wikimedia Commons
Image: D-Link_DI-524.jpg by Weihao Chiu @ Chinese Wikipedia, CC BY-SA 3.0, via Wikimedia Commons
Image: Outdoor wireless security IP camera at Nuthurst, Sussex 2.jpg by Acabashi, CC BY-SA 4.0, via Wikimedia Commons
Image: Various keys on keyring.jpg by Pittigrilli, CC BY-SA 4.0, via Wikimedia Commons
Image: Home-office-336377.jpg by By Free-Photos from Pixabay, CC0, via Wikimedia Commons
Image: Fire extinguisher near to open door.jpg by Latte1703, CC BY-SA 4.0, via Wikimedia Commons
Image: Computer Laboratory.jpg by Kiruthikapalani, CC BY-SA 4.0, via Wikimedia Commons
Image: Credit card terminal in Laos.jpg by Basile Morin, CC BY-SA 4.0, via Wikimedia Commons
Image: LaCuCa card reader - payment terminal at supermarket register.jpg by Syced, CC0, via Wikimedia Commons
Image: Server Room (22397102849).jpg by Carl Lender from Sunrise, USA, CC BY 2.0, via Wikimedia Commons
Image: Datacenter Server Racks (22370909788).jpg by Carl Lender from Sunrise, USA, CC BY 2.0, via Wikimedia Commons
Image: UPS Power Management Module, iDataPlex racks with network cabling in NERSC data center (2).jpg by D Coetzee, CC0, via Wikimedia Commons
Image: Blue Screen of Death on Internet Terminal.JPG by Ente75, CC0, via Wikimedia Commons
Image: Racks Amravati Data Center.jpg by PiDatacenters, CC BY-SA 4.0, via Wikimedia Commons
Image: Wikimedia Foundation Servers-8055 13.jpg by Victorgrigas, CC BY-SA 3.0, via Wikimedia Commons