which is Your best technique In Seo..?

Hello friends,

I want to know that which is Your best technique In Seo..?

21 Off-Page SEO Strategies to Build Your Online Reputation
1). Community Creation in Social Networking Sites
2). Blogging
3). Forum Postings
4). Search Engine Submission
5). Directory Submission
6). Social Bookmarking
6). Link Exchange
7). Link Baiting
8). Cross-Linking
9). Photo Sharing
10). Video Promotions
11). Business Reviews
12). Local Listings & Yellow Pages
13). Article Submission
14). Press Release Promotion
15). Classifieds Submission
16). Social Shopping Network
17). Answers
18). Document Sharing
19) CSS, W3C & RSS Directories Submission
20). Widget / Gadget Development
21). PPC Ad Campaign

My Best SEO techniques are:

Keyword density
Optimized and updated content
Blogging
Social Media Marketing
Social Bookmarking
Press Release submission
Forum posts

Best SEO Off page Activity.

Content posting
Bookmarking submission
Yahoo answering
Directory submission
Forum Posting
Press Release submission
Video submission
Images sharing

Your SEO efforts are really only as good as the experience you're creating for your target persona.

Blog Commenting
Bookmarking
Blog Submission.