It sounds like Kali is installed on partition 5.
Code:
+-------------+--------------+--------------+---------------+
| partition 5 | partition 6 | partition 7 | partition 8 |
| | | | |
| 10G | 1G | 2G | 462G |
| | | | |
+-------------+--------------+--------------+---------------+
In that case it's possible to enlarge partition 5 by adding space to the right of it with a partitioning tool such as Gparted. One way to do this is to boot up a live disk with the Gparted program on it and make the adjusments.
Gparted is available on it's own bootdisk from here:
https://gparted.org/livecd.php, where there is also documentation on the website about how to proceed.
The partitions 6, 7 and 8 would have their data lost in a new partitioning, so if you have data you wish to save, then it would need to be backed it up. Gparted on their website itself advises to take a whole image or partition image backup.
If however, there is nothing to back up, you can simply re-partition the disk to more amenable sizes and re-install the distro and start again.
It's possible to use other partitioning tools to do the same job from the command line, but since you mention you are "kinda new on linux", Gparted is probably the easiest way, though it's important to read the documentation so that you know what you are doing.
Suitable sizes for a root partition vary depending on a user's intended uses. For just running an installation that isn't expected to grow much, 30G to 50G may suffice. If on the other hand one might be running a number of virtual machines, then those sizes may need to be doubled or trebled. Horses for courses.