A written recommendation carries far more credibility than a skill endorsement, because an endorsement requires only a single click with no explanation, while a recommendation is a specific, written testimony from someone who worked with you directly -- third-party validation is inherently more persuasive than self-description, since a viewer assumes some objectivity from someone other than the subject. When requesting a recommendation, it helps to ask for something specific rather than a vague favor -- for example, asking a former manager to speak to a particular project and the outcome it had, which produces a more detailed and more useful recommendation than a generic request produces. The 'Featured' section and the 'Licenses & Certifications' section are underused opportunities to add tangible, checkable proof of skill -- a published article, a portfolio piece, or a completed certificate course all function as evidence a reader can verify, rather than simply taking a claim on faith.