How bold text on LinkedIn works
LinkedIn posts are plain text. The bold and italic letters here are separate Unicode characters that look like styled letters, so they survive the paste.
Use them sparingly: screen readers may read them letter by letter, and LinkedIn search doesn’t match them to normal words. Bold a hook or one key line, not whole paragraphs.
Win the first lines
LinkedIn shows the first few lines of a post — about 210 characters on desktop, fewer on a phone — then “…see more”. Everything that makes someone click has to be above that cut. The preview shows where it falls.