Can we comment here multiple times?
(I assume "here" = welcome thread.) Yes, of course. But no need to introduce yourself more than once.
Is there a place to talk about our personal experiences and efforts
The most recent "Group Rationality Diary" thread might be the best place for that.
[...] timeline [...]
Once upon a time, an economist called Robin Hanson started a blog called "Overcoming Bias". He invited one Eliezer Yudkowsky, an amateur artaificial intelligence theorist and philosopher (note: he might disagree with that characterization), to post on his blog, and for some time OB was a joint Hanson/Yudkowsky blog, with Yudkowsky's contributions constituting a sort of informal course in rationality-as-Eliezer-sees-it. After a few years of this, Robin Hanson wanted his blog back and quite a community had built up that was mostly following and commenting on Eliezer's posts, and a new site was created for that community: lesswrong.com. It was seeded with all Eliezer's old OB posts. It was a thriving would-be-rationalist community for some time, but in the last few years a lot of what used to be its regulars have gone elsewhere and it's generally reckoned that both quality and quantity of content here are much lower than they used to be. There are various plausible conjectures about why. There are occasional attempts to fix this by various means.
Is there a max comment length?
Probably, but it's pretty long. I don't recall ever hitting it, and (some of) my comments tend to be longer than most.
[...] politics [...]
Unfortunately, political discussions here have often turned out quite unhelpful -- more heat than light. So political discussion (especially if more specific) is generally discouraged here. There is fairly frequent political discussion, in a somewhat-rationalist community, in the open threads at Slate Star Codex (whose author was a very highly valued participant here on LW until he went his own way).
How can I get up to date on the latest parts of Less Wrong?
I don't think there's anything cleverer than reading the recent archives. You could look for particularly highly-voted posts, but note that until quite recently there was one user with a multitude of sockpuppets mass-downvoting everything posted by people whose politics he didn't like (and, for all I know, mass-upvoting things posted by people whose politics he did, but that hasn't been noticed if so) so the scores on things are less useful than you might hope.
(Thread A for January 2017 is here, this was created as a duplicate but it's too late to fix it now.)
Hi, do you read the LessWrong website, but haven't commented yet (or not very much)? Are you a bit scared of the harsh community, or do you feel that questions which are new and interesting for you could be old and boring for the older members?
This is the place for the new members to become courageous and ask what they wanted to ask. Or just to say hi.
The older members are strongly encouraged to be gentle and patient (or just skip the entire discussion if they can't).
Newbies, welcome!
The long version:
A few notes about the site mechanics
A few notes about the community
If English is not your first language, don't let that make you afraid to post or comment. You can get English help on Discussion- or Main-level posts by sending a PM to one of the following users (use the "send message" link on the upper right of their user page). Either put the text of the post in the PM, or just say that you'd like English help and you'll get a response with an email address.
* Normal_Anomaly
* Randaly
* shokwave
* Barry Cotter
A note for theists: you will find the Less Wrong community to be predominantly atheist, though not completely so, and most of us are genuinely respectful of religious people who keep the usual community norms. It's worth saying that we might think religion is off-topic in some places where you think it's on-topic, so be thoughtful about where and how you start explicitly talking about it; some of us are happy to talk about religion, some of us aren't interested. Bear in mind that many of us really, truly have given full consideration to theistic claims and found them to be false, so starting with the most common arguments is pretty likely just to annoy people. Anyhow, it's absolutely OK to mention that you're religious in your welcome post and to invite a discussion there.
A list of some posts that are pretty awesome
I recommend the major sequences to everybody, but I realize how daunting they look at first. So for purposes of immediate gratification, the following posts are particularly interesting/illuminating/provocative and don't require any previous reading:
More suggestions are welcome! Or just check out the top-rated posts from the history of Less Wrong. Most posts at +50 or more are well worth your time.
Welcome to Less Wrong, and we look forward to hearing from you throughout the site!