To make it easy, I always attach the word "possible" to anything that isn't 100%.

100% het means it definitely carries the gene. It came from breeding an actual albino to a normal or another het.

If you breed 2 100% hets, any normal looking offspring are 66% possible het (66% chance that they carry the albino gene) and must be bred to either an actual albino or a 100% het to try to prove it out. Your chances of getting an actual visual albino go up if you breed it to a visual albino.

If you breed a 100% het to a normal (not het or possible het at all) all babies are normal appearing and are considered 50% possible het. There is a 50% chance that they carry the gene. They also must be bred to an actual albino to prove wether or not they actually carry the gene. Or they can be bred to a 100% het to try that way.

Keep in mind, even when breeding 2 100% proven hets, you are not always going to get an albino in the clutch. You are much more likely to get visuals if one of the parents is an actual visual.