First, for making sure the autosave files—the ones prefixed and suffixed by “#”—are cleaned up, ensure that delete-auto-save-files is non-nil (the default) and, if using Emacs 28 or later, set kill-buffer-delete-auto-save-files to non-nil (that would normally be t). As for the backup files ending in “~”, those are created on saving a modified file by default and their creation is disabled by setting make-backup-files to a non-nil value.

All of this can be achieved, assuming you’re using Emacs 28 or later, by adding

;; Disable backup files.
(setf make-backup-files nil)
;; Prompt to delete autosaves when killing buffers.
(setf kill-buffer-delete-auto-save-files t)

to your init file.

use save-visited-file-mode (possibly, I’m using phone

there is some ways to solve this, one is not creating this kind of files, not recommended, another way is changing the path are this is saved, setting `backup-directory-alist` and `auto-save-file-name-transforms` you can change where this files is stored, you can also use no-litterring to this.

Autosaves aren’t needed once you’ve saved – but emacs should already be removing them when you save your changes.

Backups are very specifically protecting you from the situation where the thing you saved was wrong. If you think that’s useless, you haven’t understood the purpose.