あげる means "to give something to somebody" from the giver's perspective. Whereas, くれる means "the speaker or somebody on his side gets something from somebody." 彼女（かのじょ）が花（はな）をくれた。=My girlfriend gave me flowers. (It implies that YOU got those flowers from her.) 彼女が花をあげた。=My girlfriend gave (someone) flowers. (You don't know who she gave those flowers to.) 友達（ともだち）が写真(しゃしん)を撮（と）ってくれた。=My friend took a picture of/for me. 友達が写真を撮ってあげた。=My friend took a picture for someone. 兄(あに)が私の息子（むすこ）にカメラをくれた。=My brother gave my son a camera. (I would use this if I'm happy for the son.) 兄が私の息子にカメラをあげた。=My brother gave my son a camera. (Sounds objective. Focus is the fact that my bro gave a camera.) Ah, the more I try to explain, the more I get confused, but I hope those examples will help in some way. ;)

あげる - giving a favor to someone else (can as well be written as 上げる) くれる - receiving a favor from someone else http://www.guidetojapanese.org/favordiag.gif This simply picture helped me understand it better, so maybe it would help you as well! 教えてくれた。- Received a favor [from someone else] of being taught something. 教えてあげた。- Gave a favor [to someone else] of teaching them something. ここまで読んでくれて嬉しいです！ - I'm happy you gave me the favor of reading it until here. 式（しき）を解けて（とけて）あげた。- I gave [someone] a favor of solving the formula. I hope this helps you ^^

くれる is bring something & あげる is increase according to google translate

http://www.guidetojapanese.org/favor.html check this out :)