This is the 747th most frequent Italian word.
rendere
"Rendere" means "to render," "to make," "to return," or "to give back" in English.
In this sentence, "rendere" is used in its sense of 'to make' or 'to turn into' something, where it conveys how the experience transformed the feeling of confidence.
Questa esperienza unica mi ha reso più fiducioso.
This unique experience made me more confident.
Here, "rendere" refers to the process of making something achieve a specific state or quality, in this case, the document being readable.
Posso rendere il documento leggibile per tutti.
I can make the document readable for everyone.
In this context, "rendere" is again used to express causing something to become or be perceived in a specific way, emphasizing the action's result.