备 and 奋 look alike but are different. You will most frequently encounter 备 in 准备 which means: get ready, be prepared.
zhun3 means allow grant permit. Ice determinant on the left, short tailed bird on the right.
biNg1 冰 + ZHui1 隹 = zhun3 准
frozen (ideograph of 2 dots for frozen) + water (pictograph seen from the sky two banks and river between) + short tailed bird (pictograph) = ALLOW GRANT PERMIT zhun3
When the ice freezes the water you GRANT the short tailed bird some food and ALLOW it to eat the stuble from the land you walk on otherwise it would starve and you would have insects all summer long and a poor harvest.
Now PERMITTED ALLOWED GRANTED
Short tailed bird but cold as ice
PERMITTED to do as she likes.
bei4 means to prepare to get ready 准备的备
备 = on top is 夂 zhi3, the image of a man walking around on his 田 tian2 field. He is walking around PREPARING his field for planting harvest or construction. This is an ideogram, not a phono-semantic character. There is no phonetic clue to the pronunciation of 备.
GET READY in German is BEreIt
Impel PREPARATION, GET READY.
奋 fen means to exert.
大田=奋 da+tiaN = feN
OMG! Is this FEN … a slave plantation!?
BIG red Farmer in a FEN WORKING HARD is a friend!