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For many decades, the main source of information on the top-left cornerelement of the Cabibbo-Kobayashi-Maskawa quark mixing matrix $V_{ud}$ weresuperallowed nuclear beta decays with an impressive 0.01\% precision. Thisprecision, apart from experimental data, relies on theoretical calculations inwhich nuclear structure-dependent effects and uncertainties play a prime role.This review is dedicated to a thorough reassessment of all ingredients thatenter the extraction of the value of $V_{ud}$ from experimental data. We triedto keep balance between historical retrospect and new developments, many ofwhich occurred in just five past years. They have not yet been reviewed in acomplete manner, not least because new results are a-coming. This review aimsat filling this gap and offers an in-depth yet accessible summary of all recentdevelopments.

Superallowed nuclear beta decays and precision tests of the Standard Model