widgets and custum fields

I’m not entirely sure I understand your question. If you want to add extra fields for text/links/stuff to a widget then yeah you can do that. You’ll have to build your own widget with the items you want.

that’s what i want, for now, i know only how to add custom fields to post or page, but i dont know how to build my own widget with extra fields,
if possible a tut or a code!
thanks

There are lots of tutorials, that’s what google is for. Here are some links I collected for you.

https://wpengineer.com/1023/wordpress-built-a-widget/
https://justintadlock.com/archives/2009/05/26/the-complete-guide-to-creating-widgets-in-wordpress-28
https://codex.www.ads-software.com/Widgets_API