@Julianto 

As far as I know, TP-Link doesn't have any online training or courses.

They have materials for certification for their partners though

https://partner.tp-link.com/certify-detailed-intro.html?courseType=TPNA+SMB

and good guides

https://static.tp-link.com/2018/201804/20180420/1910012393_T1500_UG.pdf - user guide

https://static.tp-link.com/2018/201804/20180420/1910012396_T1500_CLI.pdf - cli guide

https://www.tp-link.com/en/support/download/t1500g-10mps/#Related-Documents - good examples