Adding Nutrients Rookie Grower

I’m growing out of organic soil. Only week 2... but I’m seeing all these extras you can add to help growth... I need it broken down in dummy form. Do I need nutrients if I get the “best” soil? Or just let it grow and the soil does it’s magic? Trees are about a week from transplant to a 5g pot. wanted to wait on my new light and see if I should go ahead and order these nutrients as well..
 
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