The recommended redirect type is a 301 redirect. This is because it avoids performance impacts for users; their browsers will remember the redirect and avoid unnecessary network round trips in the future.
The three tips to reduce duplicate content are:
This video provides three tips to avoid or remove duplicate content from a website. The speaker addresses common misconceptions about duplicate content's impact on site quality and explains how it affects crawling and performance. The video focuses on practical solutions for website owners.
<link rel="canonical" href="...">) helps Google determine which URL to index when multiple URLs have the same content. While helpful, Google may still choose a different URL.