Need advice

Hi Family.
should i study old guides and threads about SEO or just stick to the new ones?
i mean are the old ways still effective in ranking website?
also i am using PBN method for traffic and want to buy domains related to my niche that has good cf tf da stuff and backlinks from amazon, any advice where can i buy those and how?
Thanks in advance

SEO has been quite changed in last few years. So, you can stick to white hat method while PBN really works like charm for everyone.
Finding the high quality domains, you can watch this video for step by step guide: https://www.quicksprout.com/university/how-to-find-affordable-expired-domains/
Add loads of content, build PBN and keep building backlinks to get success.
Good Luck!