In the past two decades, we have witnessed the discovery of a 
handful assortment of `strong'ly interacting particles such as 
tetraquarks, pentaquarks, etc., that go beyond a conventional 
quark-antiquark meson and a three-quark baryon picture. A deeper 
understanding of the underlying quark-level and effective hadron-hadron 
interactions that drive their existence is crucial in identifying the 
conditions under which they come to be. Recent advancements in 
first-principles numerical studies using lattice QCD methodologies have 
provided valuable insights into these interactions, particularly those 
involving strange, charm, and bottom quarks. In this presentation, I 
will discuss the latest developments in this field and their potential 
implications in the future research.