The Bible teaches us to walk in the Spirit (Galatians 5:16). Everyone either walks in the Spirit or the flesh. The Spirit is the Holy Spirit who indwells every believer in Christ (Romans 8:9). The flesh refers to our old sinful nature. Those without the grace of God in Christ, live according to the flesh. So then, those who are in the flesh cannot please God (Romans 8:8).
Every believer's victory is walking in the Spirit. Walk in the Spirit, and you shall not fulfill the lust of the flesh (Galatians 5:16). Lust includes any sinful desire. To walk in the Spirit is yielding to the Holy Spirit, who lives within every believer (Romans 8:9). Those who have been saved by grace through faith in Christ have died to the old life, to walk in newness of life. And those who are Christ's have crucified the flesh with its passions and desires (Galatians 5:24).
Walk in the fruit of the Spirit. But the fruit of the Spirit is love, joy, peace, longsuffering, kindness, goodness, faithfulness, gentleness, self-control (Galatians 5:22). Believers don't produce fruit, the Holy Spirit does within us. Jesus said, By their fruit you will know them (Matthew 7:20).
The fruit of the Spirit describes who Christ is within the believer. The first word describes the fruit of love. The fruit of the Spirit is the love of Christ working in the believer. Believers walk in the Spirit with God's love. It is faith working through love (Galatians 5:6).