This is the 94th most frequent Swedish word.
själv
"Self" or "oneself."
Here, 'själv' emphasizes that the subject (I) completed the action independently.
Jag gjorde det själv.
I did it myself.
The use of 'själv' in this question emphasizes whether the listener is capable of performing the task independently.
Kan du klara det själv?
Can you manage it yourself?
In this case, 'självständig' describes someone as being self-reliant or independent, highlighting the usage of 'själv' as part of an adjective.