Here is a list of tips for using Reddit that you could find useful:
https://www.thrillist.com/culture/how-t ... ment-suiteWhat app are you using? I'm guessing you are using their official one. If on Android I find that "reddit Is fun" is the best app personally. If on iOS I hear that Bacon Reader is a good alternative to the official app, but in my experience I actually prefer the official one.
I'm assuming you have made an account if you are posting things, so if you have and you are on the official app, anything you click that + mark on is saved to your "Saved" page. To access it on the app click the top left of your screen, the "options bars." Then click your user name. That should take you to your profile and a list including your history, saved, posts, comments, etc.
That options sidebar will also have all of the subreddits you have subscribed to. If you haven't been able to subscribe to any, the way to do so is to go to the subreddit and click the three dots in the top right of your screen. There should be a "subscribe" option.
On the topic of r/nosleep, that is a very interesting sub but I don't tend to have time for it haha. A lot of the people are good writers (some not so much) but they like to drag things out into like 5 parters and I just forget about them so I don't often bother. The point of that sub is to pretend that whatever is posted is 100% real. You aren't supposed to, or allowed to, question their story at all. It's just for entertainment. Very rarely have I seen anything that has seemed real at all honestly, but I do remember this one post a year or so ago where a guy posted video evidence that someone had broken into his house while he was playing video games (headphones on) and when he thought he heard something strange outside he got up and recorded with his phone. After posting the video people pointed out that the assailant could be seen hiding from him in the video; one moment there is an oddly shaped human-looking figure in a corner of his dining room and then when he walks back through the figure is gone but he didn't notice. The issue with that sub is that I'll never know for sure if it was a real thing or a set up, but it really seemed real and if it was fake the guy sold the shit out of it.
Also, as for your post about the Ghost Busters car, if it doesn't receive enough upvotes you will never really see it in the sub itself unless you sort by new, but after a certain amount of time you won't find it there either. You should still be able to find it in your submitted section unless it was deleted for some reason, which will happen occasionally because the mod teams can be very strict about following the rules, especially in the bigger subs. Unfortunately, your submissions are at the whims of others and whether they find it entertaining enough to upvote it and get it attention. Likewise, I once posted a photo of a Jurassic Park Jeep around my area and nobody particularly cared, but I've submitted other things to /r/mildlyinteresting and other subs that have made it to the front page of the sub, which is always a nice feeling.
This message brought to you by My Brain, courtesy of My Fingers.
"We all are to some extent [agnostic]... So yes, I'm an 'agnostic', in as much as I don't actually know what happens when I die. I choose to operate under the assumption that God does not exist. I have no need for God in my life, the concept of a 'God' feels incredibly made up to me. It is not requisite for my every day living. For some people it is. They are 'theistic agnostics,' I am an 'atheistic agnostic.'" - Cara Santa Maria