How do I know if a word is masculine or feminine?

We can often find out the gender of nouns in French by looking at the spelling. The end of the word can give us a clue. for example, words ending in -age, -ier, -oir and -eur and mostly masculine, such as (l')étage, (le) plombier, (le) mirroir and (l')acteur. Feminine nouns mostly end in 'e' and can end in -ette, -agne, -oire and -ine, such as (la) maisonette, (la) montagne, (l')histoire and (la) copine. Another way to tell the gender is to think about the real gender of the noun if it is an animate noun - a person or living thing. This is sometimes reftered to as logical gender. An example is le/la médecin or un/une écologiste depending on whether the person is a man or a woman. There are other rules such as: always use 'le' for languages (using the standalone adjective). e.g le chinois, le français... This works 95% of the time and that there are exceptions. Most masculine nouns end in just a consonant but exceptions to this include 'la faim', 'la soif', 'la main', 'la fin'. Here is a website which covers this particular topic and features a video which would be helpful as it puts the information in a different format to improve comprehension: https://www.frenchspanishonline.com/magazine/masculine-or-feminine-gender/