[ubuntu] ubuntu no space left on device

I move from Windows to Linux
I think I have less space in my drive for updates and installation.

I'm trying to install D-space when this error display "ubuntu no space left on device"
df-h result
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 7.1G 7.0G 0 100% /
udev 10M 0 10M 0% /dev
tmpfs 793M 9.4M 784M 2% /run
tmpfs 2.0G 172K 2.0G 1% /dev/shm
tmpfs 5.0M 16K 5.0M 1% /run/lock
tmpfs 2.0G 0 2.0G 0% /sys/fs/cgroup
tmpfs 397M 16K 397M 1% /run/user/120
tmpfs 397M 12K 397M 1% /run/user/1000

Please help me to solve this problem.

I have another drive sda3 217 GB