The sheer number of resources available on search engine optimization can be overwhelming. There are a ton of sites, tools, and conferences to choose from and it can be confusing and somewhat scary. I've compiled a list of good, credible resources here in order to steer you in the right direction and so you don't end up getting some bad advice.
These are sites that have general information on search engine optimization and search engines. They offer news, information, and search engine optimization tips.
Search Engine Watch
Marketing Terms - This dictionary will help you understand all of the search engine terms you come across.
Search Engine Relationship Chart - This chart shows you which search engines are connected to each other so you know what search engines to submit your site to and optimize for.
Search Engines - Tips on search engine optimization and promotion.
Google SEO Guidelines - Google's brief information on search engine optimization.
SEO Beginners Guide - Rand Fishkin writes a detailed guide on search engine optimization for beginners. It is a long read, but well worth it.
Search Engine Guide
Search Engine Colossus - This is a directory of all of the search engines in the world. If you are looking to target other countries, it is important to get familiar with the search engines in that country.
Here is a list of tools that will be useful if you are looking to do search engine optimization. Some of the tools give you insight on search terms and others give you an idea of how well optimized your site is. These tools are great for research or for improving the optimization of your website.
GoogSpy - If you are interested in finding out what search terms your competition is ranked for or is adverting on, then this site will be a great tool for you.
Wordtracker - This is a keyword research tool that tells you the popularity of certain keywords across the major search engines. It also gives you suggestions on other related terms that are high and low in traffic.
Search Term Suggestion - This tool comes directly from Yahoo and it gives you an idea on how popular search terms are. This gives you good input on what terms you want your site to be optimized for. Be careful because the total number does not mean that a high ranking for that keyword will get you that amount of traffic.
Meta Tag Analyzer
Google Toolbar - If you want to find out your site's Google PageRank you will need to install this toolbar. It will show you your PageRank, but be careful because it is not frequently updated.
Marketleap Link Popularity Checker - This link popularity checker will show how many sites link to you for each search engine. It can also show you the number of sites that link to your competitors. They also have a neat feature that shows the growth or decline in your link popularity over time.
Digital Point SEO Tools
SEO Chat Tools/
We Build Pages SEO Tools
You may want to pay attention to blogs if you are looking to keep up with daily search engine news, information, and the latest search engine optimization tips. Blogs provide a constant update of news and information about the latest ideas. This space is constantly changing, so it's important to stay current with what is going on.
Search Engine Blog
Search Engine Roundtable - This is one of the more unique blogs out there. There are search engine conferences that go on every couple months and they write about each session. It's like being at the conference and listening to the speakers.
Search Engine Watch Blog
Matt Cutts - This is the blog by one of Google's engineers. He is their most popular engineer and writes about Google, search engine optimization, and gadgets.
Search Engine Journal
Search Engine Lowdown
John Battelle's Search Blog
Google - Blog News Channel
SEO by the Sea
Google Blogoscoped - Covers the ins and outs of Google. Sometimes they have information about Google before it is released to the general public. There are also interviews with Google employees.
Search Engine Forums
Forums are a great resource if you need help, input, or are just looking for information on search engine optimization. You post your questions and can expect a response from other people with their thoughts. This is great for finding information and getting help.
Search Engine Forum
High Rankings Forum
I Help You Forum
Webmaster World - Unlike most of the search engine forums, this is a paid forum and you have to pay yearly fees to be part of it. There are thousands of members and they discuss search engine optimization, news, tips, and general Internet-related topics.
SEO Chat Forum
Digital Point Forum
Search Engine Watch Forum
Conferences are a great way to take your learning to the next level and get deeper into the industry. Conferences allow you to listen to experts in the field, meet them in person, and talk to people from the major search engines.
Search Engine Strategies - They hold conferences every couple months all over the world. They have sessions for beginners and you can also meet people from the major search engines.
PubCon - This is a search engine related conference that covers everything from general information to search engine optimization tips. They have conferences every couple months and the price is cheaper than Search Engine Strategies. The downfall is that the conference is smaller with less attendees.