The best essential oils to start are the ones that can be used for multiple of different ways and are most recognized. I recommend everyone gets started with a premium starter kit, which includes the 12 oils listed below along with a diffuser, it is definitely the most bang for your buck and includes a diffuser.
In the meantime, scroll below to read a quick snapshot of each starter kit oil; why I love+how I use each one!

Lavender

Why I love it ! is soo calming emotionally and physically
Lemon

Why I love it: makes me feel happy and clean!
Peppermint

Why I love it: gives me energy + calms an upset tummy + focuses my attention +
Frankincense

Why I love it: glowy toned skin + calms nerves + overall health
Raven blend

How I use it: chest roller
Why I love it: fresh + invigorating kids chest and pre-workouts
Valor blend

How I use it: roll on my throat + DIY face serum
Why I love it: invokes feelings of courage + strength
Stress Away blend

How I use: chaotic moment calmer
Why I love it: promotes feelings of relaxation + being centered
Citrus Fresh blend

How I use it: room sprays + dryer balls + home cleaning
Why I love it! uplifts + energizes any space
Digize blend

How I use it: digestive support and rich in antioxidant
Why I love it! calms tummy upset
Thieves Blend

How I use it: kitchen counters, veggie soak, immune support
Why I love it! Queen of immune system + smells like fall
Peace + Calming blend

How I use it: apply wrists, behine ears
Why I love it: CALM in a bottle
Panaway Blend

How I use it: roll down my legs and bottom of feet
Why I love it! my hips relax and legs wake up energized