Indeed, it is the de facto language. In 2020, if you learn it, you’ll be able to build not just modern web applications but also any applications for any device and platform. In addition, you probably have noticed how technologies as a whole are changing.
Should I learn C++ or Python?
Python leads to one conclusion: Python is better for beginners in terms of its easy-to-read code and simple syntax. Additionally, Python is a good option for web development (backend), while C++ is not very popular in web development of any kind. Python is also a leading language for data analysis and machine learning.