What is the difference between Gern and Gerne? I've seen both used but have no idea which one is used when. Also, Is "beide" a determiner? I've seen beide, beiden, and beides but I have no clue what each is used for.

Hi there, first of all I like your user name, very nice! "beide" means "both". The ending changes depending on the gender and the case. For example: Ich habe meine beiden Schwestern gerne. - I like both of my sisters Ich habe beide Hosen gekauft - I bought both pairs of pants Reiten und joggen - er macht beides gerne - horse back riding and swimming - he enjoys doing both. Have a look at the Rocket German grammar lessons on the German cases (Nominative, Genitive, Dative and Accusative) to find out more. "gern" and "gerne" are both fine. Often the -e is omitted as it is easier and faster to say. By the way that's the case with many words. "gerne" has many meaning: gladly, certainly, etc. I hope that helps!