GND! How do I make right ground conections?!?

[l4m4.m4n]

Hello!
I am new to electronics and I don't really get how to make grounding.
For example here: https://www.olimex.com/dev/images/avr-pg1b-sch.gif
I need to connect all lines for grounding together or just to leave them interrupted?

Also advice me a good introductory book to electronics.
is not updated so I could not get something good for me.
Thanks a lot!

 

[blueroomelectronics]

All the grounds connect together.

 

[ericgibbs]

Also advice me a good introductory book to electronics.
Thanks a lot!

hi,
Look at these links:


Digital Electronics Tutorial
https://www.mikroe.com/en/books/