You can install OptiFine for free by downloading it from the official website, opening the file, and then launching "Minecraft." ...
Minecraft, created by Markus "Notch" Persson long before it became the most successful game of all time and a $2bn payday to Microsoft, was written in Java. Notch obfuscated the code to prevent others ...
You can install mods in "Minecraft" by playing the "Java Edition" and using the third-party app Minecraft Forge.