Peter teaches us we should be loving and never repay evil for evil and that we should always be able to give a reason for hope that we have in Jesus Christ. This can range from giving evidence for the resurrection and creation to the existence of God, etc. But it's primary meaning is that we testify to what has done or is doing in our lives.
1 Peter 3:8-22
New King James Version (NKJV)
Called to Blessing
“He who would love lifeAnd see good days,Let him refrain his tongue from evil,And his lips from speaking deceit.11 Let him turn away from evil and do good;Let him seek peace and pursue it.12 For the eyes of the Lord are on the righteous,And His ears are open to their prayers;But the face of the Lord is against those who do evil.”[b]