Installing QGIS

https://courses.spatialthoughts.com/install-qgis-ltr.html

Book

A Gentle Introduction to GIS — QGIS Documentation documentation

suggested study plan:

Week 1: Introduction to GIS

• Day 1: Read Chapter 1 (Preamble) and Chapter 2.1 (Introducing GIS - Overview). Familiarize yourself with the basic concepts of GIS.
• Day 2: Read Chapter 2.2 to 2.4 (More about GIS, What is GIS Software, Getting a GIS Application). Install QGIS on your computer.
• Day 3: Explore the QGIS interface based on the information from Chapter 2. Try opening a sample project or dataset.

Week 2: Understanding Vector Data

• Day 1: Read Chapter 3.1 (Vector Data - Overview). Understand the difference between point, line, and polygon features.
• Day 2: Read Chapter 3.2 to 3.4 (Point, Polyline, Polygon Features in Detail). Open QGIS and explore these features using sample data.
• Day 3: Read Chapter 3.5 (Vector Data in Layers). Practice creating and editing layers in QGIS.

Week 3: Vector Attributes and Spatial Analysis

• Day 1: Read Chapter 4 (Vector Attribute Data). Learn about attributes and how they are used in GIS.