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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Salesforce MVP | Lightning Champion | 17x Salesforce Certified | Application Architect | 7x Trailhead Ranger | Techforce Services | Australia

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