Placing a visualforce page on sidebar is really simple.
1) Create a visualforce page.
2) Create a custom HTML homepage component. Place the following code in the HTML area.

<iframe src="/apex/[VF PAGE NAME]" width="100%" frameborder="0" height="100"></iframe>

replace [VF PAGE NAME] your custom page name.
3)Place it on the left side of home page layout.

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I am Sakthivel Madesh, a certified Salesforce Advanced Developer & Administrator working on Salesforce Technology since 2011. I am currently working in Techforce Services as Sr. Salesforce Developer. I have worked on multiple technologies Like PHP, Java, Salesforce, I am very passionate about Salesforce and to earn 15x Salesforce Certification. I love Trailhead for learning Salesforce Skill and Become a Trailhead 5x Ranger too. I Love to Learn & Share my Salesforce knowledge to Salesforce Learners/Beginner using My Blog and Salesforce Community.

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