Free study material for every IT certification

Our mission

Good study material shouldn’t sit behind a paywall. Connect4IT collects and writes practical resources for the certifications and skills IT professionals actually use, and keeps every one of them free to read and download, with no sign-up required. The site is supported by advertising, which is what keeps it free.

What we cover

• Networking: CCNA, CCNP and CCIE notes, lab workbooks, and Cisco, Juniper and Huawei command references.
• Cybersecurity: CISSP, CompTIA Security+, OSCP, SOC analyst and penetration-testing guides.
• Data & BI: SQL, Power BI and DAX, data science and data analyst interview preparation.
• Programming: Java and Python notes, coding questions and interview guides.
• Cloud & DevOps: Linux administration, DevOps roadmaps and interviews, AWS and Azure.

How we prepare each resource

• Explained, not just linked: every PDF comes with a write-up of what is inside, who it is for and how to use it.
• Mapped to the exam: where it helps, we show how a resource fits the current exam objectives, such as the 8 CISSP domains or the CCNA 200-301 topics.
• Kept up to date: we review older posts, fix broken links and add study plans, FAQs and related resources.

Who it’s for

Students starting their first certification, engineers moving into a new track, and anyone preparing for a technical interview. If a resource helped you, or you are looking for one we don’t have yet, we’d love to hear from you.

Part of the Connect4Techs network

Connect4IT is the English IT-certification site of Connect4Techs, a group of free learning sites for the tech community.

Connect4IT is an independent learning resource and is not affiliated with Cisco, CompTIA, ISC2, OffSec, AWS, Microsoft or any other certification body. All trademarks belong to their respective owners.