Have a 2011 Honda crv. Can I change the oil filter and later the oil or is it best to change it all at once?

Have a 2011 Honda crv. Can I change the oil filter and later the oil or is it best to change it all at once?

All at once.

Technically, you can change the oil filter first and then the oil later. However, the loss the oil from the filter will cause you to add oil (about half a quart) and then you have a mix of old and new oil. So, stick with doing both at the same time, as Joseph said.