Press release links: Avoid overusing press release distribution sites, as Google views them as manipulative link schemes.
Foreign guestbook links: Manipulative links from foreign guestbooks can lead to ranking drops; consider disavowing them.
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Discussion forum links: While not all forum links are bad, spammy or foreign forum links can harm your site's reputation.
Random nofollow links: Google can detect spammy link building, even if links are nofollowed, potentially harming your site's credibility.
Private Blog Networks (PBNs): Using PBNs for link building can now lead to significant penalties from Google and loss of organic traffic.
Nofollowed (& followed) social bookmark links: Social bookmarking links are considered manipulative and can adversely affect your site's SEO.
Directory submissions: Submitting to low-quality directories can harm your rankings; focus on relevant directories for natural link building.
Blog comments: Avoid spammy blog comments, as they don't provide SEO benefits and may lead to penalties.
Links from cheap services: Links acquired from services like Fiverr may leave patterns detectable by Google's algorithms, leading to penalties.
Automatic link-building programs: Tools like GSA Search Engine Ranker are less effective and can harm your SEO efforts, especially on money sites.