The easiest way to learn how to play Magic is to actually play it. But reading about game strategies is a lot different from actually putting them into practice.
There’s also a pretty robust online community. You can find plenty of strategy guides and tips through the official MTG archives, like knowing when to attack and when to block, how to chump block and the importance of card advantage.
There Should Be More Magic: The Gathering Dinner Parties Learning how to play
