stockfish - Why do Engines show a fraction for the Depth and Current Node values? - Chess Stack Exchange

Forgive me if this has been asked elsewhere, but I've both Googled and searched here at CSE and cannot find an answer. When I'm using an Engine for analysis (in this case, Stockfish 15), I've noticed

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evaluation - Why does stockfish move quality increase non-monotonically with increasing depth? -- selected moves at depth 3 are worse than depth 1 - Chess Stack Exchange

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What are some interesting math facts about chess? : r/math

Dissecting Stockfish Part 2: In-Depth Look at a chess engine, by Antoine Champion

Stockfish - Chessprogramming wiki

Deep Reinforcement Learning – arXiv Vanity

What does it mean if I beat the 'computer' at chess? Are there better computers (apps) that I can play? - Quora

Why can Stockfish give different evaluations at the same depth? - Quora

PDF) Statistical analysis of chess games: space control and tipping points