  I give a self-contained introduction to the resource theory approach to
quantum thermodynamics. I will introduce in an elementary manner the technical
machinery necessary to unpack and prove the core statements of the theory. The
topics covered include the so-called `many second laws of thermodynamics',
thermo-majorisation and symmetry constraints on the evolution of quantum
coherence. Among the elementary applications, I explicitly work out the bounds
on deterministic work extraction and formation, discuss the complete solution
of the theory for a single qubit and present the irreversibility of coherence
transfers. The aim is to facilitate the task of those researchers interested in
engaging and contributing to this topic, presenting scope and motivation of its
core assumptions and discussing the relation between the resource theory and
complementary approaches.
