Welcome to my FREE Tech Fundamentals course, designed to equip you with the foundational technical knowledge you need to succeed in the tech industry. This course is specifically aimed at beginners who are interested in learning about various technical concepts that will help them in their job interviews and when studying other tech-related topics.

The Tech Fundamentals course covers a wide range of topics, including the OSI 7-Layer model, decimal to binary maths, encryptionDDOS attacks, Layer 7 firewallsHSMsHashingDigital SignaturesDNSDNSSECContainersBackups & DR, and much more. You will gain a comprehensive understanding of these topics, and you will be able to apply this knowledge in various technical situations.

In this course, you will be taught through theoretical explanations that are designed to help you grasp the underlying principles of each topic. The course is structured in a way that allows you to learn at your own pace and enables you to revisit the content as many times as you need to ensure that you fully understand each topic.

Whether you are an aspiring IT professional or someone who wants to develop a foundational technical knowledge to navigate the digital world more effectively, this course is for you. By the end of this course, you will be better equipped to understand and apply technical concepts that will be essential for your future career in tech.

This course is constantly updated with new topics based on requests from my students or when I find topics important in general.

Join us now and take the first step towards becoming a proficient tech professional

OSI 七层模型概述
自下而上(从底层硬件到顶层应用程序),这七层分别为:
  1. 物理层 (Physical Layer):负责将数据转换为比特流(0 和 1)并通过物理介质(如电缆、光纤、无线信号)传输。
  2. 数据链路层 (Data Link Layer):负责节点之间的数据传输,负责定义数据帧的格式、错误控制和物理寻址(MAC 地址)。
  3. 网络层 (Network Layer):处理数据在网络间的传递,决定数据的最佳路径,即路由功能。主要协议是 IP。
  4. 传输层 (Transport Layer):负责端到端的数据传输、流量控制和错误控制。主要协议是 TCP(面向连接)和 UDP(无连接)。
  5. 会话层 (Session Layer):负责建立、管理和终止应用程序之间的连接(会话)。
  6. 表示层 (Presentation Layer):负责数据的格式化、转换、加密和解密,确保应用层能理解数据。
  7. 应用层 (Application Layer):最顶层,直接为用户提供网络服务(如 HTTP、FTP、SMTP