URL structure is an important aspect of SEO because it is also considered as one of the key factors for ranking. Below are the points to consider while writing SEO-friendly URL.
Use relevant keyword but do not overuse it, use hyphens to separate words, remove numbers or dates from URLs, all letters should be in lowercase, and keep URLs short and simple. If you want to use numbers in URLs then write it in the letter format rather than in the number format.
Ex. www[dot]7heaven[dot]com <<< www[dot]sevenheaven[dot]com