Adding Helpful UI Improvements

(column-number-mode)
(global-display-line-numbers-mode t)

;; Disable line numbers for some modes
(dolist (mode '(org-mode-hook
                term-mode-hook
                eshell-mode-hook))
  (add-hook mode (lambda () (display-line-numbers-mode 0))))

(use-package rainbow-delimiters
  :hook (prog-mode . rainbow-delimiters-mode))

which-key package on GitHub

(use-package which-key
  :init (which-key-mode)
  :diminish which-key-mode
  :config
  (setq which-key-idle-delay 0.3))

ivy-rich package on GitHub

(use-package ivy-rich
  :init
  (ivy-rich-mode 1)
  :config
  (setq ivy-format-function #'ivy-format-function-line)
  (setq ivy-rich--display-transformers-list
        (plist-put ivy-rich--display-transformers-list
                   'ivy-switch-buffer
                   '(:columns
                     ((ivy-rich-candidate (:width 40))
                      (ivy-rich-switch-buffer-indicators (:width 4 :face error :align right)); return the buffer indicators
                      (ivy-rich-switch-buffer-major-mode (:width 12 :face warning))          ; return the major mode info
                      (ivy-rich-switch-buffer-project (:width 15 :face success))             ; return project name using `projectile'
                      (ivy-rich-switch-buffer-path (:width (lambda (x) (ivy-rich-switch-buffer-shorten-path x (ivy-rich-minibuffer-width 0.3))))))  ; return file path relative to project root or `default-directory' if project is nil
                     :predicate
                     (lambda (cand)
                       (if-let ((buffer (get-buffer cand)))
                           ;; Don't mess with EXWM buffers
                           (with-current-buffer buffer
                             (not (derived-mode-p 'exwm-mode)))))))))

helpful package on GitHub

doom-themes package on GitHub

• doom theme
• which-key
• Line numbers (hooks)