yes!

so after browsing the root of the device, and reading through some guides in this forum, i found out that apps are not fully removed when uninstalled.

what i did is:

xterm.
sudo gainroot
cd /home (/opt, /user, etc)
and delete all the app directories that i uninstall

result is a 300mb space freed from my 2gb app memory.

my questions:

-is this a good way to do this? (i know its a lot of work but works for freeng up space in eMMC)

-is there other directories that apps' datas are installed other that /opt and /user?

please advise. my deepest thanks.