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My background is in CS and I’m currently working as an ML engineer, but I’m very eager to go back for a PhD soon.

In the mean time, I’ve noticed my maths isn’t as strong as I’d like it to be. That aside, I’ve also taken a big interest into calculus.

Are there any online courses (free or non-free) that would allow me to learn mathematics either through self study, or as a MOOC? I’ll gladly take undegrad level courses. I just want something structured.

I’ve found that even trying to really study through books things like number theory, proofs, and integration takes huuuuge time investments. I feel like this will be less so with a structured course and teacher.

I'm making the move from my old (8+ years) gmail account to fastmail, mainly for privacy reasons and what not.

Has anyone ever done this, and/or how would you recommend starting this new email account? I want to leave the gmail days behind and don't want to just export/import my GBs of emails from one provider to the other. I'd like a fresh start.

Is it just as simple as updating services I use to this new email, telling my friends, etc. Or would you suggest creating new accounts for this email and abandoning all others. I don't use social media so it's not a big issue, but for example, my Apple ID for my phone.

Hope I've been able to explain what I'm trying to accomplish.