It's difficult to research everything on your own but the 4 sources below can help you keep up. Track the updates and see if they effect you and your business.
You can Follow the source itself
1. Inside Search: official Google search blog
2. MozCast Google Algorithm Weather Forecast
This is a good source to see daily impact the algorithms have on the web in general.
Every 24 hours 1000 keywords are audited for deciding the top 10 results that are showing for that query.
These results are then compared to the previous day to see the differences.
visit daily for algorithm tracking and weather reports
3. Matt Cutts Google+
Matt is head of the web-spam team at Google. He's a type of spokesperson for the organic side of Google search results. He often posts when a major roll out happens in the algorithm and typically announces an estimate of how much of the web will be affected.
4. Seomoz Google Algorithm Change History
Find data, name and details of each algorithm update since 2000 and extra sources for each update.
In summary, change literally happens every day and staying on top of it is to be always thinking about what search engine are emphasizing as most important such as:
- Quality high volume content
- A quality site built for the user
- Authority relevant Backlinks
add on: check your PR
google page rank update and check your PR