Question about Steam/PC gaming?

Hey to anyone reading this! I just have a couple of question regarding pc gaming. Long story short I have always played console (PS4, PS3, XBOX ONE, XBOS 360) but I'm finally able to play pc gaming now. I have always had a passion for building PC's for editing but I finally did my first gaming build! My... show more Hey to anyone reading this! I just have a couple of question regarding pc gaming. Long story short I have always played console (PS4, PS3, XBOX ONE, XBOS 360) but I'm finally able to play pc gaming now. I have always had a passion for building PC's for editing but I finally did my first gaming build!

My first question is, is steam pretty much like xbox live and play station plus where your steam ID/gamertag comes with you in everygame so that no one else can take your name or not? If not how does it work? My last question is for the pc people will i notice a huge difference in quality and how it runs compared to say my xbox one or ps4. Here are my build specs btw. Thanks for your time.

Video Card: Asus GeForce GTX 970 4GB
CPU Intel Core: i7-4790K 4.0GHz Quad-Core
CPU Cooler: Shadow Rock Topflow SRI CPU Cooler
RAM: Kingston HyperX Fury 16GB (2 x 8GB)
SSD: Kingston HyperX 3K 240GB 2.5” Solid State Drive
Hard Drive: Seagate 2TB 3.5” 7200RPM Hybrid Internal
Motherboard: Asus Z971-PLUS Mini ITX LGA1150
Powersupply: EVGA SuperNova GS 650W
Case: Corsair 380T Mini ITX Tower

Mic: Blue Yeti
Headset: Logitech G930
Monitor: BenQ 24” Dual (24” x 2)
Keyboard: Razer Blackwidow Chroma
Capturecard: Avermedia Live Gamer Extreme
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