For a modern company it is essential to present itself on the internet - even if it does not want to sell goods via this selling channel. But a such internet presence does only make sense, if you do a little bit of search engine optimization. You can not benefit from a website that nobody can see.
The search engine optimization consists of two general parts: the onpage and the offpage search engine optimization. Both influence the ranking in the search engines in equal measure - if one part does not work, so all the other efforts in the other part will not be successful, too. However the offpage optimization receives often the greater attention - it even is the greater part of the optimization work.
A professional linkbuilding does not restrict to collect as many links as possible. It is much more important to build up the link structure as natural als possible. In the best case the linkbuilding is done continuously and the position in the search engines is boosted up by and by. Too many measures of the offpage search engine optimization and a too excessive done linkbuilding often do not lead into a better search engine position, but even into a degradation of the concerning website.
In the course of a professional linkbuilding should not too much links be generated at once. Although it does not matter from which sources they originate. It is better to create continuously new links over and over again. One of your goals should be to generate one link per day - that is enough.
Additionally you should use as many sources for your professional linkbuilding as possible. Do not restrict yourself to links only from blog comments or forum posts, because a too onesided link structure will attract the attention of the search engines sooner or later. Instead of that use the possibility to place links by social bookmarks, social media services, webcatalogue entries, interviews etc. A very easy and outstanding effective measure is the buying of text links on existing and well established pages. The renting of links is indeed not for free, but without any effort you, if you use a textlink marketplace like Linkmads.
Of course you may outsource the largest part of the SEO work to a service provider. But you should consider for your choice, that you choose an experienced search engine optimizer, which does only use the by the search engines permitted measures and does not practices so named black hat SEO.