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+# 90-Day DevOps Learning Plan
+
+## Current Level
+- Student, Final year B.Tech CSE
+- Intermediate Level
+
+## Why DevOps & Cloud
+- DevOps is the bridge between Development and Operations.
+- DevOps is about Automation instead of doing tasks manually.
+- Cloud is delivery of on-demand Computing power, database storage, networking via aws, azure etc.
+-  Using cloud-native services to build elastic, scalable environments that run automated delivery processes seamlessly.
+
+## Goals (Next 90 Days)
+1. Deploy a full working end-to-end software.
+2. Stay consistent for next 90-days.
+3. Work on as much as cloud services as possible.
+
+## Core Skills to Build
+1. Terraform, Ansible.
+2. CI/CD pipeline- Github Actions, Jenkins etc.
+3. Kubernetes
+
+## Weekly Time Budget
+- Weekdays: 2 hours
+- Weekends: 5 hours
+
+## Staying Consistent
+- Set Alarm, Follow a timetable.
+- Track my progress at every end of week.
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+# Day 02 – Linux Architecture, Processes, and systemd
+
+## Linux Architecture
+- It is divided into different layers:
+  1. Hardware: Physical Components, the actual machine (CPU, RAM, Disk)
+  2. Kernel: The core of linux, the heart of the machine that runs everything- memory, CPU scheduling, devices, file systems.
+  3. Shell: Interface between the User and kernel. User sends command through shell to Kernel.
+  4. Application: The apps used by users in the system- nginx, docker, podman etc.
+ 
+## Processes
+- Executing instance of any program is a process.
+- Every process have a unique PID.
+- systemd is the first process with PID = 1.
+- Types of processes:
+  1. Running: Process that is actively using CPU.
+  2. Sleeping: Process that is waiting for some result, input or output.
+  3. Zombie: Process that is terminated but waiting for parent process to exit (takes no resource just a empty process).
+  4. Stopped: Process that is stopped by interruption (mostly by ctrl + Z).
+  5. Dead: Process that is completely terminated by Kernel.
+
+## systemd
+- It is the service manager in linux
+- Handles all the services running in background
+- have PID = 1, first process that is always running under the hood.
+
+## 5 most common commands used in Linux used on daily basis
+1. systemctl: To check status or start/stop a service.
+2. df -h: Check the disk usage.
+3. top: live process monitor
+4. ps aux: show running processes.
+5. kill -9 PID: forcefully kill a process.