Please avoid this.
If you or anyone else is thinking about learning Morse code, I implore you never to look at a visual representation of dits and dahs - either in a chart or writing it out. When you learn it with a visual representation, which apparently is how it used to be taught to Cub Scouts and others in the US, it creates in your mind an extra translation step - a big lookup-table translation step in your mind that will forever limit you to slow speeds. You would be unlikely to break 13 wpm and you will never enjoy it.
The proper way to learn is by associating the sound with the letter.
The best operators, those who effortlessly comprehend 30+ wpm, hear entire words and phrases by the sound pattern alone. So start by using one of the many apps available for PC's or phones that teach you the code by sound association. That is the only way to become proficient, but it is also the easiest and most enjoyable way.