WLS certificate .

Hi,

                 

we are looking for information simple and basic of doifferenct wordk related to JAVA certificate in WLS, please could expla smple word  following word:

files

.crt

.key

.cer

.pfx

Keystore

Alias

trusts

and my doubt:

1.after apply changes, as posttask,  do I need to press apply button and then restart WLS instance?

2.are there any file.log to notice  see the changes?

3.are there any simple task/excersice to test try this new cahnges?

thanks in advance