Hello. I want to use a coaster type that can go really fast but also be smooth. I see a lot of smooth coasters on youtube and I would just like to know. Thank you. So what is it?

Metal track coasters are the smoothest...wooodies are known and well known as rough and tumble coasters

Its really all just about skill on building. No track is the "smoothest".

Woddies are well known to be rougher rides in real life , that is what i meant...i have been on extreme coasters that are all metal and they dont hurt you really,but get on a woodie...and you will get jolted around a lot more...my last trip on a woodie really hurt me back

While you're riding on the ride, click and drag the screen a little out of position. If done correctly, the screen will be positioned forward the entire ride, regardless of speed or anything like that.