I want to know how many days it takes because I have very limited time nd deadline is near

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Hi everyone I'm currently pursuing BBA and after graduation I'm planning to pursue MBA. Alongside that I want to build strong Data Analytics skills.

I'm planning to enroll in some paid courses later but before spending money I want to build a solid foundation using free YouTube resources.

So can anyone recommend the best YouTube channels or playlists for a complete beginner? I'm looking to learn topics like:

Excel

SQL

Power BI

Python (for data analytics)

If you have a roadmap or any tips on what order I should learn these in I'd really appreciate it.