format <user,group,other>
7 read, write and execute 111
6 read and write 110
5 read and execute 101
4 read only 100
3 write and execute 011
2 write only 010
1 execute only 001
0 none 000

u user the owner of the file
g group users who are members of the file's group
o others users who are neither the owner of the file nor members of the file's group
a all all three of the above, same as ugo

r read read a file or list a directory's contents
w write write to a file or directory
x execute execute a file or recurse a directory tree
X special execute
s setuid/gid details in Special modes section
t sticky details in Special modes section

chmod -R u+rwX,g-rwx,o-rx PersonalStuff
chmod -R a+x,a-rw TEST