Precision at the LHC: why and how

With Run II, the LHC experiment already reached an unprecedented
level of precision compared to previous hadron colliders. The amount
of data collected in Run III and the High-Luminosity run will increase
quickly and dramatically. I will discuss specific challenges to theorists
that must be overcome to provide predictions that have the precision
necessary to match the accuracy of data. A few novel ideas to exploit
this precision directly or indirectly will also be discussed.