d3 first steps

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Based on

• https://www.youtube.com/watch?v=cu-I2um024k&list=PL6il2r9i3BqH9PmbOf5wA5E1wOG3FT22p&index=17
• https://www.youtube.com/watch?v=0CZ7-f9wXiM&index=18&list=PL6il2r9i3BqH9PmbOf5wA5E1wOG3FT22p