Al-jawab billahi at-taufeeq (the answer with Allah's guidance)
Sadaqa comes from the word : Sadaqa : to be truthful. Sadaqa is derived from Sidq meaning that the person is giving charity to help the poor and needy confirming his true devotion and service to Allah.
The types of Sadaqah are various.
Please view this: http://www.muftisays.com/qa.php?viewpage=viewQA&question=1079
Sadaqah is not restricted to giving part of one's wealth or any special deed of righteousness. Islam considers all good deeds as Sadaqah.
Allah Ta'ala says,
“Those who (in charity) spend of their goods by night and by day, in secret and in public have their reward with their Lord. On them shall be no fear nor shall they grieve.” (2:274)
“…that which you give for charity, seeking the Countenance of Allah, (will increase); it is those who will get a recompense multiplied.” (30:39)
"For Muslim men and women, for believing men and women for devout men and women for true men and women, for men and women who are patient and constant, for men and women who humble themselves, for men and women who give in charity, for men and women who fast, for men and women who guard their chastity, and for men and women who engage much in Allah’s remembrance for them has Allah prepared forgiveness and great reward." (33:35)
Abu Musa (Radhiallahu Anhu) narrated that the Prophet (Sallallahu Alaihi Wa Sallam) said, “Every Muslim has to give in Sadaqah (charity).” The people asked, “O Allah’s Messenger (Sallallahu Alaihi Wa Sallam)! If someone has nothing to give, what will he do?” He said, “He should work with his hands and benefit himself and also give in charity (from what he earns).” The people further asked, “If he cannot do even that?” He replied, “Then he should help the needy who appeal for help.” Then the people asked, “If he cannot do that?” He replied, “Then he should perform all that is good and keep away from all that is evil and this will be regarded as charitable deeds.” (Bukhari)
Abu Hurairah (Radhiallahu Anhu) narrated that “Abu Dharr (Radhiallahu Anhu) said to the Messenger of Allah, ‘The wealthy people have all the rewards; they pray as we pray; they fast as we fast; and they have surplus wealth which they give in charity; but we have no wealth which we may give in charity.’ Allah’s Messenger (Sallallahu Alaihi Wa Sallam) said: ‘Abu Dharr, should I not teach you phrases by which you acquire the rank of those who excel you? No one can acquire your rank except one who acts like you.’ He said, Why not, Allah’s Messenger (Sallallahu Alaihi Wa Sallam)?
He said: ‘Exalt Allah say: "Allahu Akbar" (Allah is Most Great) after each prayer thirty-three times; and praise Him say: "Alhamdulillah" (Praise be to Allah) thirty-three times; and glorify Him say: "Subhan Allah" (Glory be to Allah) thirty-three times; and end it by saying, "La Ilaha Illallahu Wahdahu La Shareeka Lahu, Lahul Mulku Wa Lahul Hamdu Yuhyi Wa Yumeetu Wa Huwa ‘Ala Kulli Shai’in Qadeer." ( There is no god but Allah alone, He has no partner, to Him belongs the Kingdom, to Him praise is due and He has power over everything.) Your sins will be forgiven, even if they are like the foam of the sea.’” (Abu Dawud)
Abu Dharr (Radhiallahu Anhu) narrated that Allah’s Messenger (Sallallahu Alaihi Wa Sallam) said, “In the morning charity is due from every bone in the body of every one of you. Every utterance of Allah’s glorification is an act of charity. Every utterance of praise of Him is an act of charity; every utterance of profession of His Oneness is an act of charity; every utterance of profession of His Greatness is an act of charity; enjoining good is an act of charity; forbidding what is disreputable is an act of charity; and two Rak'ahs which one prays in the forenoon will suffice.” (Muslim)
Mu'aadh bin Jabal (Radhiallahu Anhu) related from the Prophet (Sallallahu Alaihi Wa Sallam) “Sadaqah extinguishes sin as water extinguishes fire.” (Ahmad, Tirmidhi)
The Prophet (Sallallahu Alaihi Wasallam) said:
“If a human dies, then his good deeds stop except for three: a Sadaqa Jariah (continuous charity), a beneficial knowledge, or a righteous child who prays for him”. Narrated by Muslim.
May Allah Ta'ala, Most Merciful give us opportunities to do many ways of giving Sadaqah for His pleasure and reward us in the Aakhirah (Hereafter). Ameen.
And Only Allah Ta'ala Knows Best.