Class Field Theory Video Lectures

There are videos from the 2018 edition of the Connecticut Summer School in Number Theory, featuring a lecture series (Minicourse A) by Liang Xiao on "Basic Algebraic Number Theory". Lecture notes and exercises are available at the page linked above, while the video recording is on Youtube. You could also keep an eye on the 2020 edition, which features more minicourses on Number Theory. I hope this is helpful, while answering only part of your question.

I was looking myself for some video lectures and just found this course https://kskedlaya.org/math204b-win21/ by Kedlaya which looks promising.

When do iterations of a polynomial converge uniformly on compact subsets of the complex plane

Derivation of the shape of the catenary curve, clarification of a particular step

Exterior derivative leibniz rule geometric

Is it true that $E_{\theta} \left ( \frac{\partial}{\partial \theta} \log p_{\theta} (X) \right ) = 0$?

How many adjacent edges in an $n \times n$ grid of squares?

Strong convergence in $L^p(\mathbb{R}^N)$

Rational Points on the genus $2$ curve $y^2 = x^6 - 4x^2+4$.

Interesting examples of first-order, one-sorted proper extensions of PA

Evaluate line integral for a vector field

Is the class number of $K$ the number of factorizations an element of $\mathcal{O}_K$ can have?

Upper bound on expectation of truncated random variable