What new features appeared in C++17 and how to use them in real projects?

Hello everyone! I've been writing in C++ for about a year, mainly using C++11/14. I recently started learning C++17 and noticed that a lot of code in open-source projects uses constructs I don't understand.\n\nFor example, I often see code like this:\n

auto [x, y, z] = getPoint();

\nOr this:\n

if (auto it = map.find(key); it != map.end()) { ... }

\nOr also this:\n

std::variant<int, float, std::string> v = 42;

\n\nMy question: what exactly are the innovations brought by C++17? I've heard about structured bindings, if-init, std::variant, std::optional, but how do all these work in practice? Is there anything else worth knowing?\n\nI'm particularly interested in:\n1. Which features actually simplify everyday development?\n2. What changed in the standard library