There are no guarantees in life. We are saying people can earn at least $500 per month after 4-5 months working with Wealthy Affiliate and $3000 per month after 1 year because that is how 90% of members in Wealthy Affiliate have earned. So, it is not guarantee but just a practical data. Now it is up to you either you want to be the part of it or not.
Who is your audience? What is your target market or niche? If you're targeting a specific niche like home security then perhaps you only need to sign up to ADT and SpyBase so your products match your audience. There’s no point promoting eco-mattresses to your blog that’s focused on reviewing drones. Again, you could sign up to a network that has a few different options in your field of interest or just go straight to your favourite suppliers and see if they have an affiliate program.
The ads in affiliate programs are linked to company websites and are referred to as affiliate links. Affiliates generally have to apply for the affiliate programs, though the majority of the affiliate programs cost nothing to join. When an online visitor click the affiliate link, the visitor is redirected to the advertiser's website and if the customer/visitor makes a purchase, the affiliate is then paid a commission.