difference between PSCustomObject, Hashtable, Object[]

ispublic isserial name                                     basetype                                                                                                                                                               -------- -------- ----                                     --------                                                                                                                                                               true     false    pscustomobject                           system.object                                                                                                                                                            ispublic isserial name                                     basetype                                                                                                                                                               -------- -------- ----                                     --------                                                                                                                                                               true     true     hashtable                                system.object                                                                                                                                                            ispublic isserial name                                     basetype                                                                                                                                                               -------- -------- ----                                     --------                                                                                                                                                               true     true     object[]                                 system.array  

guys explain me in brief way differences between 3 since of them outputting same list

what confuses me last 1 since says system.array , has key , value hashtable 

name                           value  ----                           -----  db.username                    fsfs  db.password                    fsfs  db.data                        fsfs  db.host                        fsfs  db.kb                          fsfs

a link full 

what recommend learning powershell. basics, intermediate , advanced levels

thanks in advance 

check link. guide better learning.

https://technet.microsoft.com/en-us/scriptcenter/dd793612.aspx

also keep on seeing blogs regarding powershell. give new ideas in various environments.

one of favorite blog regarding powershell - http://blogs.technet.com/b/heyscriptingguy

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