Hello. Today, I would like to introduce you to game platforms such as Steam, Origin, and EA. This is Epic Games, which offers free games every week.
 
www.epicgames.com/store/ko/free-games

Once you sign up and access the link above, you will see a list of games. If you go to the detail page of the game you want, you will see a blue [Get] button on the right. When you click the button, the order window appears as below.

Just agree to the terms and conditions at the bottom right and click the [Order] button. It's very simple, isn't it? 
To actually play the game, you need to install the Epic Games access program, but if you only buy free games, you don't have to install the program. In particular, it is possible to purchase from a smartphone as well as a PC.  So, if you see a game you want, it's good to get it before it disappears.  You can install it later. 

 
How do I play a game I've received?
Install the Epic Games platform program, and then install the game in the program. If you just want to see your purchase history, access the site from your PC and hover over your nickname in the upper right corner, and you will see the ACCOUNT or account menu. Select the [Transaction] item from the left menu to check your entire purchase history.   

 
It's not just that free games are boring. You may be lucky and get a good game.
The games I bought for free from Epic Games are Sid Meiers Civilization Vl (Civilization 5),  Football Manager 2020 (Football Manager 2020), Jurassic World Evolution (Jurassic World Evolution), STAR WARS™ Battlefront™ II: Celebration Edition (Star Wars Battlefront 2). It's good to check periodically. 

I hope you get good games in the future, and I hope this was helpful.
Thank you.