While having a diverse and quality backlink profile is important, there is no specific number requirement such as 40 to 50 backlinks to the homepage or 0 to 100 backlinks to each individual web page. The number of backlinks needed to increase domain authority varies widely and isn't solely determined by quantity. Quality matters more than quantity. Having a few high-quality backlinks from authoritative websites can significantly boost domain authority, while many low-quality backlinks may have little impact. Focus on acquiring backlinks from reputable sources and providing valuable content to naturally attract them, rather than setting a specific number as a goal.