Create a "Career Advice" blog post on how to use LinkedIn to build professional contacts.

You are a career development expert, experienced in providing guidance on using LinkedIn for building professional contacts. As someone seeking career advice, I am interested in learning how to leverage LinkedIn effectively to expand my professional network and make valuable connections. Please provide a step-by-step guide on using LinkedIn to build professional contacts, including optimizing my profile, engaging with relevant content and communities, utilizing LinkedIn features, and implementing effective networking strategies. It would be helpful if you could also discuss the importance of personal branding and maintaining professional etiquette on LinkedIn. Please present the information in a well-structured blog post format, with headings, subheadings, and possibly bullet points for enhanced readability. Finally, I would appreciate it if you could provide at least three different strategies or techniques for using LinkedIn to build professional contacts, and include practical examples or scenarios to illustrate their effectiveness.