I'd like to learn vector calculus (to better understand Maxwell's Equations). Does anyone have any learning resources they could recommend? I've got this video

I'd like to learn vector calculus (to better understand Maxwell's Equations). Does anyone have any learning resources they could recommend? I've got this video in my Watch Later queue on YouTube, but if there are any other resources that give a clear introduction to the material I'd be interested in them. To give a bit of background, I learnt the basics of calculus back in school but I haven't used it in over 15 years, so I'm likely to need to get the basics down first. https://www.youtube.com/watch?v=wsOoClvZmic https://www.youtube.com/watch?v=wsOoClvZmic