TikTok allows a website link on eligible accounts. The usual path: open your profile, edit profile, add a website URL, save. That URL is your link in bio.
Before you paste anything, decide what the click should do. One landing page with a few clear links beats sending people to a single random post.
Create your page on 1kb.bio, then paste https://1kb.bio/yourname into TikTok. Same URL works for Instagram and elsewhere, so you maintain one simple source of truth.
See a sample tiktok link in bio page — with a profile photo and the same simple layout you get on 1kb.bio.