I can’t connect ARDUINO uno
Jainis:
I can’t connect ARDUINO uno
Can't connect it to what?
This is a mystery question 
Please provide as much detail as you can. If this is about connecting to computer
Which version of the IDE.
Which OS and version.
Did you select correct serial port or can't you select.
Is, what you selected, the correct board and port?
What does device manager (or linux/mac counter part) say.
Any error messages anywhere.