Added leader key mappings

init.vim

@@ -32,15 +32,30 @@ tnoremap <C-Esc> <Esc>
 " clear search with F2
 nnoremap <F2> noh
 
-" clear trailing spaces with F3
-nnoremap <F3> :%s/\s *$//g<CR>
+" Use "," as leader
+let mapleader = ","
 
-" show Vim's true competitor with Ctrl-F1
-nnoremap <F4> :!open https://youtu.be/jn40Ugz0vuk<CR><CR>
+" Switch between Windows with: Leader w
+nnoremap <Leader>w <C-w><C-w>
+
+" Show next buffer with: Leader n
+nnoremap <Leader>n :bn<cr>
+
+" Delete buffer with: Leader d
+nnoremap <Leader>d :bd<cr>
+
+" clear trailing spaces with: Leader t s
+nnoremap <Leader>ts :%s/\s *$//g<CR>
+
+" Reload config with: Leader R
+nnoremap <Leader>R :source ~/.config/nvim/init.vim<cr>
+
+" show Vim's true competitor with: Leader r c m
+nnoremap <Leader>rcm :!open https://youtu.be/jn40Ugz0vuk<CR><CR>
 
 " COLORSCHEME
 
-" set colorscheme to onedark.vim for nvim and airline
+" set colorscheme to onedark.im for nvim and airline
 packadd! onedark.vim
 colorscheme onedark
 let g:airline_theme='onedark'