Some paid courses for free in udemy (most of python related courses)

Machine Learning in Python Bootcamp with 5 Capstone Projects

Master Machine Learning Algorithms and Models in Python with hands-on Projects in Data Science. Code workbooks included.
https://www.udemy.com/course/machine-learning-d...

Time Series Analysis and Forecasting using Python

Learn about time series analysis & forecasting models in Python |Time Data Visualization|AR|MA|ARIMA|Regression| ANN
https://www.udemy.com/course/machine-learning-t...

Artificial Neural Networks (ANN) with Keras in Python and R

Understand Deep Learning and build Neural Networks using TensorFlow 2.0 and Keras in Python and R
https://www.udemy.com/course/deep-learning-with...

Neural Networks in Python: Deep Learning for Beginners

Learn Artificial Neural Networks (ANN) in Python. Build predictive deep learning models using Keras & Tensorflow| Python
https://www.udemy.com/course/neural-network-und...

The Complete Mathematics Software Developer Course for 2021

All Mathematics You Need To Know As a Programmer
https://www.udemy.com/course/mathematics-softwa...

IP Addressing and Subnetting – Zero to Hero

Go from zero to advanced in IP addressing in a single course!
https://www.udemy.com/course/ip-addressing-zero...

User Story Mapping Workshop – Scrum Product Owner

Workshop to create a User Story Map. Agile Vision and Product backlog management. Advanced Scrum. Apply it right away.
https://www.udemy.com/course/user-story-mapping...

EASY way to learn PYTHON for Beginners – 2021

The easiest way to learn Python in-depth and build complex, scalable programs!
https://www.udemy.com/course/easy-way-to-learn-...

Microsoft Excel for Scientists and Engineers

If you are in the field of science or engineering, you can Excel with this Microsoft Excel course!!
https://www.udemy.com/course/microsoft-excel-fo...

²⁰²¹ Learn Python for Data Science A-Z | Ver 5.9

Programming In Python For Data Science. Learn how to use NumPy, Pandas, Seaborn, Matplotlib, Plotly, and more!
New
https://www.udemy.com/course/2021-learn-python-...

Fundamentals of PN Junction Diode

Structure and Working of PN Junction diode
https://www.udemy.com/course/fundamentals-of-p-...