For those bigger/more difficult to get rid of things- If you can put it away and not use it/need it/think of it for a few months, then you don't need it any more.

If it isn't useful or necessary in some way, ditch it.

If it's needed fixing for 6 months and no one has fixed it, or organised to have it fixed, get rid of it or replace it with a working one.

If you come across it and haven't seen it or used it for ages, get rid of it.

If it's clothes and it doesn't fit or you haven't worn it in 6 months, you no longer need it.

Remember your kids likely don't 'need' half of the toys they own. You could probably get rid of half of it and they would barely miss them.