This is simple to understand. You have to get your main SEO on-page stuff right from the start. It’s even more important now with recent algorithm updates and Google working to value on-page content more than before.
Make sure your URL is descriptive. Most importantly make sure that it contains your main keyword.
This is the first thing everyone sees when performing a search. Make sure that your Title Tag describes your product well which also provides a good user experience. You also stand a chance to increase your CTR quite dramatically by making sure that your title stands out from the crowd.
You can increase CTR here and explain what your product does. Quick way to increase sales.
Google looks at these to decide what your page is about.
Content (Product Description)
It’s got to be detailed. I recommend at minimum 800 words for your product description, likely more. You also need to make sure that your keywords are sprinkled throughout the content along with semantically relevant keywords.
Make it happen. Internal links are super important, especially between related and relevant pages. If you can use keywords then do it, just don’t overdo it.
Product review schema is important, especially if you want to increase your CTR and your sales. Your revenue will depend on it.