For anyone else interested, Tom Leinster (also of Edinburgh Uni) has also written a good short book for beginners: https://www.maths.ed.ac.uk/~tl/bct/ https://

For anyone else interested, Tom Leinster (also of Edinburgh Uni) has also written a good short book for beginners: https://www.maths.ed.ac.uk/~tl/bct/ https://www.maths.ed.ac.uk/~tl/bct/ I did his course at uni that used this book as a basis and it was great. Tough, but great.