I am a SEO expert and have ranked many websites on all major search engines. Here is an overview of all on page/off page activities:-

1. On Page:-

Meta Tags optimization
Sitemap creation and updation
Robots.txt
Image optimization
Code optimization
Content Optimization
H1, H2 tag Optimization
URL Optimization (Seo Friendly URLs)
Google Analytics and Webmaster Setup

2. Off Page:-
Article Posting
Blog Creation and Updation
Social Bookmarking
Classifieds Posting
Business Listing
Profile Creation
Directory Submission
Content Marketing
Article Marketing
Blog Marketing

3. Social Media:-
Create Social Profiles And Update On Regular Basis

There is many other activity to get a better position on SERP.