Custom search result page as well as 404 page

Do i need to use a plugin for it or is there any built in page for search which i need to edit.

Appreciate your help.

Thanks

Have you tried google yet?
Custom search page or Plugin.
Custom 404 or Plugin.

By the way, the theme already has both: https://www.thakuralelectric.com/?s=something and
https://www.thakuralelectric.com/404. Unfortunatelly, it looks like you somehow managed to remove/disable the 404 template.

Actually, i didn’t removed the template. It was as it is. I didn’t change anything from starting.

Anyway, i will work on this and get back to you.

Thanks