This is the 16589th most frequent Russian word.
сделав
"Having done."
Here, 'сделав' (having done) is a gerund that describes an action completed beforehand, emphasizing the sequence of actions.
Он ушёл, сделав своё дело.
He left after completing his task.
In this case, 'сделав' is used as a participle, explaining the emotional response resulting from the completion of the action.
Сделав это, он почувствовал облегчение.
Having done this, he felt relieved.
The word 'сделав' demonstrates the manner in which the action was performed, detailing the style or nature of the preceding verb's action.