As a casual game, I only play DotA2, PUBG, GTA V, Battlefield, COD, AC, MMORPG Games, and some android emulator games.
So I search the internet, what is the best spec for this type of games and came up with core i5-8400 and GTX 1060. These two are really meant for each other in my opinion. I can play not only the titles that I have mentioned, but also other AAA games with 60+ fps and as a casual gamer, I'm really satisfied with this build.

*I only have 1 stick of T-Force RGB 8Gb RAM in this build and planning to add 1 more to make it 16Gb
*I am also open for suggestion to improve this build.