Couple people asked for links to soldering kits which I've build with kids:
https://s.click.aliexpress.com/e/_d6bCJMX
https://s.click.aliexpress.com/e/_dUjB5xd
https://s.click.aliexpress.com/e/_dWKcExD
https://s.click.aliexpress.com/e/_dYmx5xH
https://s.click.aliexpress.com/e/_dYTbxn5
https://s.click.aliexpress.com/e/_dVCdMgj
https://s.click.aliexpress.com/e/_d7eiQGL
https://s.click.aliexpress.com/e/_dTnKWo3