Hi Fa,
As Yaw Wen Linn suggested, it is easy to add logo and link of social channels to marketing page with Marketing Designer Tool.
In addition, you can create a content block record for your social medias to re-use them in different marketing pages.
https://docs.microsoft.com/en-us/dynamics365/marketing/content-blocks
1. Create a blank email, add a section element with layout enabled to the email content.

2. Copy the source code of whole section and paste it as HTML of a new content block record.
(Because layout section component is not enabled to content block.)
3. Drag image and text elements to each grid, then as suggested answer, attach the link to image element.

4. Add the content block to your marketing page.

Live result

Regards,
Clofly