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On the option to build from source, I agree, more information was needed, and the wiki was not helpful in that regard, either.
* The wiki link you were shown has several highlighted blocks.
* It mentioned that Lazarus and FPC are different products, it specifically says you should be using FPC3.2.0 in 2020 and has a link to another page, even more up to date, that mentions 3.2.2. Using 3.0.4 now when it was plainly out of date two years ago seems an interesting move.
* Mentions the need to resolve dependencies.
* Also mentions that 'trunk' or 'main' might be considered 'brave'.
I am definitely not saying that the wiki is complete or totally authoritative but does, at present, provide enough info to get you started if you read it. Its a wiki after all.
Main is really for people with a fair bit of background and does, sometimes, have problems. Like now, Bookmarks in the IDE don't work on the default Linux GTK2. Personally, I routinely now work with Lazarus 2.2.0rc2 because I use the the Bookmark feature a lot.
Davo
EDIT: I have edited the wiki page to make these issues clearer. And attached an image of what it said before this edit.