Technical Certification Study Guides
Comprehensive, interactive study materials for IT certifications. Built for visual learners who want to understand concepts deeply.
Study Guides
Complete Cisco Certified Network Associate course covering networking fundamentals, IP connectivity, security, automation and more.
Core 1 & Core 2 exam preparation covering hardware, networking, mobile devices, virtualization, and troubleshooting.
Networking concepts, infrastructure, network operations, security, and troubleshooting for vendor-neutral certification.
Cybersecurity fundamentals including threats, attacks, vulnerabilities, architecture, risk management, and cryptography.
Home Lab
Yulong (Charlie) Chen
IT Technician
About
I’m an IT technician and systems administrator specializing in enterprise device management, cloud identity, and cross-platform support. My work spans Apple and Windows environments, with a focus on automation, efficient deployment, and clean documentation.
Background
I’m self-taught and have been in IT since 2021, building hands-on experience across MDM, Microsoft 365 administration, virtualization, and network infrastructure. I’m currently expanding into networking and unified communications, with active homelab work and CCNA studies underway.
Outside work
I cook often, with a strong lean toward Asian cuisine. I bike in the warmer months, and stargaze in rural Pennsylvania. Based in the US since 2017.
Photography
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