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National Guitar Academy, Kids Guitar Lessons: everything you need to get started on your guitar journey,  https://nationalguitaracademy.com/kids-guitar-lessons/

OxfordOwl, Handwriting in Year 2, https://home.oxfordowl.co.uk/english/primary-handwriting/handwriting-year-2-age-6-7/

Pianist, What is the best age to start learning the piano? https://www.pianistmagazine.com/blogs/what-is-the-best-age-to-start-learning-the-piano/

PADI，Bubblemaker program, https://www.padi.com/courses/bubblemaker

PBS，What's the right age to begin music lessons, https://www.pbs.org/parents/thrive/whats-the-right-age-to-begin-music-lessons

PGA，Golf's American development model, https://www.pga.coach/Golf%27s_American_Development_Model.pdf

School of Rock, What is the best age to learn piano?https://www.schoolofrock.com/resources/keyboard/what-is-the-best-age-to-learn-piano

School of Rock, What is the best age to learn to play drums, https://www.schoolofrock.com/resources/drums/what-is-the-best-age-to-learn-to-play-drums

School of Rock, What is the best age to learn to play guitar, https://www.schoolofrock.com/resources/guitar/what-is-the-best-age-to-learn-to-play-guitar

Scuba Diving, Is your child ready to scuba dive? 5 questions to ask, https://www.scubadiving.com/is-your-child-ready-to-scuba-dive-5-questions-to-ask

Scratch Jr, Coding for young children, https://www.scratchjr.org/

The Aspen Institute, What is flag becomes the standard way of playing football until high school? https://assets.aspeninstitute.org/wp-content/uploads/2018/09/FINAL-Future-of-Football-Paper.3.pdf?_ga=2.152381241.1220528857.1614310255-343227159.1614051745

USAB，Youth Basketball Guidelines, https://www.usab.com/youth/development/youth-basketball-guidelines

USTA，USA Tennis Parents' Guide, http://assets.usta.com/assets/1/USTA_Import/USTA/dps/doc_437_2.pdf

USA Archery, Athlete development model, https://www.usarchery.org/resources/athlete-development-model-211020141337.pdf

Xenith, What is the right age to start tackle football, https://www.xenith.com/blogs/the-huddle/what-is-the-right-age-to-start-tackle-football