I have a question. I used vs code for python and I used some extensions for python like the python extension from microsoft. I currently want to use vs code for html,css and javascript. Does the pythons extensions affect my work in other languages and html and css? Do I need to disable them?
No. Extensions for languages are usually associated with a file type (.py, .css, etc.).
If the extentions you want to install in vscode dont depened on each other they will have seperated inner routines and frameworks. So no "collisions" or anything like that. In case of python you can have different environments per projects which can be tricky to handle. To learn more about that have a look at pyvenv or virtual environment.
If your files are separated with their respective file type names attached (i.e. .css, .scss, .sass, .html, .py) the extensions designed for Python would theoretically only affect the Python files. If it's a really bad extension with low reviews maybe it would have a bug, but this is highly doubtful if you stick to highly-rated plugins. Simple.