Always disclose your affiliate relationship. Most visitors will probably understand that graphic ad will lead to your getting paid, but if you write a review or use an in-text link as a recommendation, you want your readers to know that may lead to compensation as well. This ensures you retain transparency and trust with your readers, but also, it's required by the FTC's endorsement rules.
Earning income via Target affiliates, however, requires a bit of work. Cookies expire in just seven days, and commissions can be as low as just one percent, so you’ll need to be operating a high-traffic website in order to make serious cash with this program. But with Target’s much-beloved brand reputation and vast catalog, relevant product links can be a big earner for established influencers.