tomar notas is the plural form of tomar nota.
tomar nota
intransitive verb phrase
1. (to make a note; used with "de") 
Tomé nota de lo que dijo el profesor.I took note of what the professor said.
Toma nota de las palabras que no entiendas.Note down of the words that you don't understand.
Busca una hoja y toma nota de lo que voy a decir.Get a piece of paper and write down what I'm going to say.
phrase
2. (to remember) 
Tomen nota de lo que dice el anciano. Son lecciones de vida invaluables.Mark the old man's words. They're invaluable life lessons.
Examples
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