Why do some skills decay much faster than others ?

[_Kirari_]

I feel like the basic-skills maintain to be golden 24/7, but for example the lesson about colors in italian, I've done it 4 times (or so) now, keeps decaying and that's kind of annoying.. ? Like I get it, repitition is important, but repeating the sentence ''Compriamo una cintura marrone.'' 5 times a lesson is not that fun. (or useful)
:(

[Raur19]

Some words or lessons or words are more integrated into lessons than others, so when you miss a question with one of those words in it, it marks all of the words in the question as "needing to be reviewed."

[Thimble_Child]

I have that same problem. I keep having to repeat my "Phrases" even though I perfected them. When I practice them, I get 0 wrong. It always tells me that my weak words are "morgen" and a few others, even though I perfected them!

[tiramisues]

Sometimes it helps to redo the lesson with the word that just doesn't get stronger (as opposed to just strengthen it).