Building knowledge about PC parts and building PC's

Today i have made a presentation to present it in front of class, i had to build a PC for specific budget, i have chosen a low budget and more expensive one to see the difference and to check if i would be able to build something with really good quality, but not too expensive and also a monster which will work perfectly, for example for people that use their computer mostly for gaming. I had to present and explain it in front of whole class which made me more confident after.