it's not difficult to understand
это не трудно понять (eto ne trudno ponyat)
"You can learn to cook, it's not rocket science."
"Ты можешь научиться готовить, это не трудно понять." (ty mozhesh' nauchit'sya gotovit', **eto ne trudno ponyat**.)
feeling relaxed and comfortable
to make noticeable progress
To completely agree with someone
to recover and be healthy again
to abandon someone to face blame or trouble alone.
to go beyond the usual limits; to innovate