What stack do you recommend to learn to build a simple app?

I want to build an app for personal use to track tasks, discussions and workflows. It needs to be self-hosted, so I cannot use any existing options like Jira, ClickUp or similar, but they are close to the idea for the app more or less. I couldn't find anything good enough at a reasonable price for 1 user.

To do this, I need to learn a development framework. I'm not a professional programmer, but I have quite a good understanding of OOP in Python and some experience with it. I'm good at learning tech skills.

For this situation, what's the stack you recommend?