Hi @Swaan_FP3 , welcome to the forum/eWiki!
I was just working on trying to answer questions just such as yours! 
Quick reply: There are several things there - none too difficult but jolly difficult to find when you first arrive.
Let me try to give you a glimpse of the non-existent hashtag #getting-started.
Is there a manual?
No. How To pages are avaiable in two locations. These are the curated /e/ documentation How Tos and this is the community list List of HOWTOs & add your suggestions. Be sure to take advantage of the Table of Contents.
A useful way of finding out what’s on the forum/eWiki is with knowledge of Categories and tags we use. Check out the Categories page
Three documentation levels
Navigation on three levels.
- Categories page we have quite a mixture of largely unmoderated, quality topics to more lighweight theads.
- The category #ewiki is collaborative and contains many of the item metioned above, the list of [HOWTO]'s available on the site and Installation Document suggestions. However the #ewiki section does not share all the same hashtags as the forum.
- The /e/documentation section is recogniseable by the /e/ branding. These pages often do not come up when you search the forum and eWiki, so please, initially, keep bookmarks of the /e/ branded pages you might need.
Please be sure to get proficient at searching!
If you give that 10 minutes - please tell me what you find missing (#guinea-pig )
Bon chance