Two things one must bear in mind, one is always put disclaimer in post that it contains affiliate link
Thanks for mentioning the disclaimer, that's probably something one should have.
the second one is that post dont show that it is written just to catch affiliate income it should have substance for readers also.
Definitely! It's also far more likely to get ranked high by search engines if it has a lot of substance. I think that researching topics thoroughly and writing great posts is what's going to result in earning affiliate income.