Welcome to my minesweeper guide! Before we be begin I would like to mention, that this guide will not be of much help if you're a complete beginner to the game, and if you are I would just recommend playing the game for yourself and picking up the basics! Start with easy and after you get a hang of how the game works move onto medium.
Now that you've got at least a basic understand of how minesweeper works I will now go through some of the ways you can get faster at the game.
I'm putting this at the top of the list since it's super easy to do and will help you get a lot faster. Now, you might be wondering what cording actually is, so here's the definition straight from the wiki :
[quote]When an uncovered square with a number has exactly the correct number of adjacent squares flagged, performing a click with both mouse buttons on it will uncover all unmarked squares; This is called a Chord.
So If you haven't been already using this technique you should be! As stated above you can either do this by clicking both mouse buttons at the same time or by using the middle mouse button (which is pressing down on your scroll wheel). On mobile you can just double tap on a number (with the correct number of flags around it) and it will chord. It will take a bit of getting used to but once you do get used to it, it's great! This allows to clear large areas quickly without having to click every square individually, and will speed up your clears exponentially. Using the chord can also help you check if there's the right amount of bombs around a number without having to count them individually. In general it's a really helpful and relatively risk free technique which will both help you clear faster and reduce your missclicks.