SEO involves optimizing a website's content, structure, and backlinks to improve its visibility in search engine results pages (SERPs). The goal is to increase organic (non-paid) traffic to the website by ranking higher for relevant keywords.

Content marketing is the creation and distribution of valuable, relevant, and consistent content to attract and engage a target audience. It's important because it helps build trust, authority, and brand loyalty while providing valuable information to potential customers.

Social media marketing involves using social media platforms like Facebook, Instagram, Twitter, and LinkedIn to promote products or services. It can benefit businesses by increasing brand awareness, driving website traffic, and engaging with customers directly.

Common mistakes include not defining clear goals, neglecting mobile optimization, ignoring SEO best practices, not targeting the right audience, and not staying updated with industry trends.

To improve your content writing skills, practice regularly, read widely, study grammar and style guides, seek feedback from peers or mentors, and stay updated on industry trends and best practices.

To avoid plagiarism, always give credit to original sources by citing them properly. Use plagiarism detection tools to check your content, and if you're using someone else's work, obtain permission or use it within the bounds of copyright law.