Folks here in the Outdoor Living forum there are so many decking questions that there is bound to be an answer already to your questions before they have even been asked
Please browse the threads and no doubt, the thread titles will provide you with an answer
Alternatively there is the search function available and also will assist in finding the answer.
With so many repeated decking threads in here the experienced and qualified people are not able to respond with the detail you may require as their time is stretched. Best to see if the need for a new thread topic is needed before posting a repeated one