1. I don't really understand what robot.txt plugin is for. I know its to make it more friendly for crawlbots, but is there anything else to it? Or just activate and let it be?
2. HTML on all pages. Is that a plugin for WP? Im having a tough time finding info about it.
3. Finally, hellblazer said I should post my website. I definitely see the benfit in this. But should I be worried about niche hijacking? Or am I being paranoid.
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Anyways, trying to figure out offsite seo . Backlinks, social bookmarking, articles. Pretty overwhelming. Just trying to read up on it and am going to give it a try.
1) robots.txt is a smart easy thing to have on your sites. Also allows you to protect certain folder/directories/pages from being indexed in the search engines. Check out this site to get the basics down:
Creating and Using a robots.txt File
2) What do you mean? Do you want to have .html in your url extension?
3) you shouldn't worry too much about posting your site, at this stage in the game you don't have much to steal (no offense). Technically people can find out a lot about you if they know of a site you own (what other sites you own based on server ip, whois info, analytics tracking codes, etc.). For the most part, and for the sake of this thread, you should be fine.
You could also just ask a few guys if you could send it their way and ask for advice privately if you're paranoid.
For outbound linking, start by looking at your competition and seeing where there links come from. Your best bet is start off with basic comment backlinks. search for relevant keywords in Google blog search and find articles you can comment on. Tedious, but relatively solid links to start gathering. Leave quality comments when you post.
Depending on your budget, you can also get some social bookmarks by amit (red_virus) here which usually help, plus seanlopez does great work and marxvergel is offering some cool stuff. Hit the guys up and see what they can do for you.
If you can't afford that stuff, get your linkbuilding pants on and start researching. The biggest thing I would recommend is to stay super organized, keep everything recorded in spreadsheets, and study your competition.