The French language is particular about gender.
https://www.fluentu.com/blog/french/french-gender-rules/
It's even tougher in German, which has three genders--masculine, feminine and neuter. German nouns are divided about evenly among the three genders. And since you can't always tell the gender by looking at how the word is spelled, you have to memorize the genders of thousands of nouns.
Russian may be a much harder language than German for an English speaker to learn, but the gender of nouns is not much of a problem. Although Russian also has three genders, you can usually discern a noun's gender by looking at how it is spelled.