This is the first PC I build. I went with the ryzen CPU because it has a great price to performance ratio and the AM4 socket is perfect for upgrading later down the line. I am an average gamer and I mostly play RPG / open world exploring games / builder games. Especially for the last one (mainly Cities Skylines) I needed a fast processor that didn't break the bank. I am not currently looking to upgrade my LG ultrawide monitor so that's why I went with the RX5700. It is an awesome performer for 75FPS gaming on my 1080p ultrawide. Games run very smooth and almost no problems whatsoever. I was going to go with the RTX 2070 super at first but that card has almost the same performance at a much higher cost.
The games I play right now (all at 75FPS ULTRA or higher):
Far Cry 5
Kingdom Come: Deliverance
Red Dead Redemption 2
No Mans Sky
The witcher 3
I love the purple look, especially at night. I couldn't be happier
Awesome price to performance ratio, but can be very loud when under heavy load. The cooler does keep the card below 70C at all times so thats nice. I do recommend a good headset if you are gaming on this card right next to you.