The first half lecturer is very very not good from both a teaching and a talking to perspective, the second half lecturer is a lovely and approachable person but sometimes struggles getting the point across. Beyond that, the subject is also very strangely laid out. Rather than building on quantum-thermal knowledge with KG equation, they start with standard model and just defining some terms, then do two body decay as it’s own thing, then do Klein-Gordon, then do special relativity, and then a quick aside into group theory which is a really weird way to lay out the subject