baby bicycle legs lol
You can look into toys subscription from Lovevery or Kiwico. They come in every month with a booklet describing how to play with your little one and info on how they should progress.
The pathways app (free) is amazing for this! It helps you keep track of milestones and recommends activity's that help them meet milestones or work on skills. I use it when the usual rotation fails us lol
Talking to them, reading board books, looking in the mirror, tummy time.
@Mik I didn’t even know there was an app!
baby sit ups, tummy time,talking to them/ copying their cooing sounds, have them look at high contrast images (not on a screen?