For more details about Blessings, read this ArticleThe Blessings in English

Rewards of Blessings and Greetings(Darood and Salam):

It was narrated from Abdullah bin Abi Talha, from his father, that:
The Messenger of Allah (صلی اللہ علیہ وآلہ وسلم) came one day with a cheerful expression on his face, and we said: “We see you looking cheerful”. He said: “The Angel came to me and said: ‘O Muhammad, your Lord says: ‘Will it not please you (to know) that no one will send salah(blessing) upon you that I will send salah(blessing) upon him ten times, and no one will send salams upon you but I will send salams upon him ten times'”

Grade : Hasan (Darussalam)
Reference : Sunan an-Nasa’i 1283
web: http://sunnah.com/nasai/13/105

Rewards of Blessings

Abu Huraira reported:

The Messenger of Allah (PBUH) said: He who blesses me once, Allah would bless him ten times.

Reference : Sahih Muslim 408
In-book reference : Book 4, Hadith 74
web:
https://sunnah.com/muslim/4/74
https://sunnah.com/abudawud/8/115

For more details about Blessings, read this ArticleThe Blessings in English