Just now I have read this article by @Eybyoung called "Articles to write" and wanted to say a few things.
Once your articles are approved by the featured community you posted, that's the only time you'll receive a points.
It's not the only time you'll receive points.
It's not even the best way to get points.
~530 upvotes today resulted in somebody getting points.
About 110 (useful) comments today got people points ranging from 1 to 117 points! (average: 14 points)
About 420 articles today (old or new) got people points ranging from 1 to 419 points (average: 18 points)
There were 3 short posts that got people from 1 to 131 points (average 58 points)
Read this again: A helpful comment got somebody 117 points today. Because somebody else found this comment useful and upvoted it.
Somebody's article that was not even posted in a featured community got him/her 419 points! Because somebody else found this article useful and upvoted it.
Compare that to the fact that previously the best you could get was 4 points for a comment and 20 points for an article.
Even more important: your older comments, articles and posts are eligible for this too. If you leave a comment that's really useful and people keep coming back to that comment (or article) - it might keep giving you points forever.
The points system now is a bit different before, we can't get any points on comments section anymore
I'd put it this way: you can't get any points for useless comments anymore. A random "thanks, good information" comment won't bring you anything, yes. A thoughtful helpful comment that is useful to article readers might get you quite some points.
To give you an overview what articles to write, it should be fit to the communities topic
You don't have to abide by the topics list, you can create your own community and get it featured, it's not that hard (10 submissions, not necessarily new, not necessarily all articles, just show that you're able to keep your community on topic) - there are tons of topics that are not covered yet and that's not exhaustive list - just pick something that's useful and interesting to people other than the authors (see the list for examples.
If in doubt about a community topic - you can ask in comments under the list or via email email@example.com
The best way to get points now is to write good useful articles (whether you submit them to any community or not), write helpful comments, write useful short updates and stop concentrating on points.
Frankly, posting an article to Read.Cash community right now you have only 15% chance of getting points. You have a better chance of getting points from the random rewarder even if you don't submit it anywhere.
You can get points even if you post only comments and ignore the communities altogether, but post useful stuff.
By the way, don't go immediately crazy upvoting all the stuff - even if your upvotes were used for giving points - one upvote of an obviously crappy article or comment and you're upvotes are forever ignored.