why "I" is negative??

i know that KCL says that the sum of the currents that goes in

equals the sum of the currents that goes out

here i dont know what current goes into the node

and what current goes out??

i dont know how you decided the direction of each current

i am new to this stuff

and i think that the "I" current is pointed up

so it goes into the node

the second current the goes threw "R1" also come into the node

because the currect goes from the plus of the battery to minus of the battery

where did i go wrong??

i cant see the conventions here

i cant see how the currents flow using these conventions

in what case we have e-v and in what v-e

???