Pie Charts Courses

Plotly Tips - Exploratory Data Analysis
FUN WITH DATA SCIENCE via YouTube

Daily Maths
zainematics via YouTube

Diagrams, charts and graphs
The Open University via OpenLearn

Exploring data: Graphs and numerical summaries
The Open University via OpenLearn

Working with charts, graphs and tables
The Open University via OpenLearn

Matplotlib Python Tutorial
Great Learning via YouTube

CompTIA Data+ (DA0-001) Cert Prep: Domain 4.0 Visualization
LinkedIn Learning

Use Charts in Google Sheets
Google Cloud via Coursera

Let's learn D3.js - D3 for data visualization (full course)
freeCodeCamp

Plotly Tutorial
Derek Banas via YouTube