As a beginner to learning a language, one must exercise caution when consuming dictionary content.
While undoubtedly useful, a dictionary may contain archaic, obsolate, and rare usages of words.
A dictionary may contain rare readings of words. Exercise caution when absorbing certain rare readings as they may not be as useful in practice.
A dictionary may contain dense linguistic information.
On a Japanese dictionary, pay attention to entries that are marked usually or only used as kana but have headwords written with kanji.