Hello I wanted to build this serial to usb converter with ft323R, but I don't understand the small marked part on the left bottom. I found the same thing in other schematics too. I know where to connect gnd, but why is the line longer than it should be? And I don't know the Vcc part too. Thanks.
This is called "connections by net name". All nets with the same name should be treated as connected together. In your example there's a connection between the two nets labelled
VCC, and all the nets labelled
This is done to have less clutter on the schematic and prevent it from turning into a hairball or a plate of spaghetti.
You have two capacitor: small one for filtering noise, a bigger one to keep voltage level around Vcc.
Google "decoupling capacitor".