There are a couple of great resources online for children to practise using a laptop/Chromebook and to familiarise the pupils with the keyboard and practise letter formation.

Letter and number formation- https://www.doorwayonline.org.uk/literacy/letter-and-number-formation/

Typing skills- https://www.bbc.co.uk/bitesize/articles/z3c6tfr#zf8yg2p