Need full information about VPS. RDP and socks5

Hi onehacker members!
Hope you doing well.
I am seeing FREE VPS, FREE RDP, AND FREE SOCKS5
But I don’t have any information about these things.
Pleae explain me what are these things
And also explain that how to use these services and how to get these things for free.
And for what purpose these three things are used please explain, if already explained on forum, then please share link of thread.
Thank you.

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