忘れないように書いておきます。

N3 忘 bou / wasu.reru forget, oublier, olvidar N5 書 sho / ka.ku, -ga.ki, -gaki write, écrire, escritura

N4 〜ておく te oku Indicates an action done in advance as preparation, attaches to the te-form verb, means do beforehand N4 〜ようだ you da Indicates assumption based on evidence or impression, attaches to verb adjective or noun, means it seems that N5 〜ます masu Used at the end of verbs, polite present or future form, makes the sentence more polite N5 〜に ni Indicates destination, target, arrival point, specific time, or person receiving an action N5 〜よ yo Sentence ending particle adding information to listener, emphasizes statement, expresses certainty or warning