Greek Word is dunamis: (miraculous) power, might, strength This same power is found in Acts, 2 when holy Spirit descend upon 120 on Pentecost and Acts 1;8 and Romans 1; 16

The word power in this instant means a dramatic or sudden change within a human being be haviour or personality or agent of changes; For an example using dynamite to level a building down. Simply placing several sticks of dynamite around the frame work of building would level the structure within minutes. Another illustration of the word power is found within scripture in Romans 1; 14 The King James Version Bible Study defines the power that comes from God or the power of God: The English words dynamite and dynamo are derived from the word “power.”
If Paul were writing today, he would probably speak of atomic power. The gospel is so powerful that it takes people all the way into heaven. Or perhaps another verse found Acts 1; 8 where same word power or dynamo; The first followers of Jesus experienced the power of the gospel in such a profound way that they changed the entire Roman world. Before Pentecost, the Jesus’followers were confused and fearful. Where they change instantaneous & it had imprinted on their lives & others. The change came within.

Four times Paul uses the word power in the first two chapter of 1 Corinthians

•  God Power: Chapter 1,18 & 2; 4 the power of God
• Christ Power: Chapter 1 verse 24, Christ the power by him dying on the cross, and taking our sins and forgiving them
  
• Holy Spirit Power: in chapter 2;5; Acts 1; 8 says And you shall receive power he Holy Spirit has come upon you, and the Holy Spirit; by descending on 120 upper room upon the follower of in Acts 2; 2 they were all filled with the Holy Spirit and preached the Gospel .
  
• Gospel Power; In Roman 1; 16 for it is the power of God, and the gospel spread rapidly through out Roman empire.
  

Preaching The Gospel
1 Corinthians 1; 18 – 2; 1- 5

The Foolishness of the Cross

Two times he mentions this phase Christ Crucified, 1; 23 but we preach Christ crucified. 2; 2 For I determined to know nothing among you except Jesus Christ, and He crucified
We preached Christ crucified, proclaiming the gospel.
Knowing& learning the gospel.
Reading & Understanding the Bible & simply telling your story.
Believer Commentary
He loves to take up people who are of no esteem in the eyes of the world and use them to glorify Himself. These verses should serve as a rebuke to Christians who curry the favor of prominent and well-known personages and show little or no regard for the more humble saints of God.
Traill define the gospel: “ Wisdom out [side] of Christ is damning folly—righteousness out [side] of Christ is guilt and condemnation—sanctification out [side] of Christ is filth and sin—redemption out [side] of Christ is bondage and slavery.”
A. T. Pierson wrote, “His deeds and His words and His practices, these showed Him as the wisdom of God. Then come His death, burial, and resurrection: these have to do with our righteousness. Then His forty days’walk among men, His ascension up on high, the gift of the Spirit.” All the glory belongs to God No one else; Believer Commentary stated; God’s purpose in choosing those of no account in the eyes of the world is that all the glory should accrue to Himself and not to a man. Since salvation is entirely of Him, He alone is worthy to be praised.

As scripture states, “ When you were dead in your transgressions and the uncircumcision of your flesh, He made you alive together with Him, having forgiven us all our transgressions, having canceled out the certificate of debt consisting of decrees against us, which was hostile to us; and He has taken it out of the way, having nailed it to the cross. When He had disarmed the rulers and authorities. So your sins will be remember no more in heaven !!