Android Question transferring project - what must be included and what can be dropped?

hi

i have a project in b4a
there are a few folders under the main folder
i now want to transfer it for example to someone or upload it here
if i just zip it it creates a huge zip file
i see many uploaded projects as sample here that are really small zip
so what can i delete?
what must be included in the zip?
i want the project be fully alive if someone opens it and compile
i want the project be fully alive if someone opens it and compile
this can also be used to backup so the backup will be much smaller - i pack the entire main folder so it created a large zip - i want to minimize it

thanks