Crop production in many communities under smallholder farming environments has been declining partly due to soil infertility and inadequate application of mineral fertilizers by farmers. This has contributed towards food insecurity and poverty, which end up causing several challenges such as malnutrition, starvation, and hunger. To mitigate soil infertility, farmers can engage in community-based adaptation of biochar to increase food production and reduce food insecurity. Therefore, the aim of this chapter is to unlock the potential of biochar in improving soil fertility and crop yields for smallholder farmers across the globe. The chapter used a systematic review to collect data from published articles. The reviewed results showed that the use of biochar as an agricultural resilient strategy improved soil property, water use efficiency, and crop yields. Application of biochar at 7.5 t ha−1 reduced soil bulk density from 1.1 g cm−1 to 0.99 g cm−1, increased microbial population by 20–124%, and increased water retention by 191% in sandy soils. Application of 10–20 t ha−1 was reported to increase wheat grain yield by 0.79 t ha−1 above those not applied biochar and increase water use efficiency by 35% in semiarid areas. Biochar has the potential of increasing crop yields by 50–150%, and this boosts food production, especially for farmers in semiarid areas. The use of biochar has demonstrated that it has high potential to improve soil properties, reduce greenhouse gas emissions, mitigate the effects of climate change, and increase crop yields, especially in smallholder farming environments located in semiarid areas. Sustainable agriculture can be highly achieved by smallholder farmers using biochar in semiarid areas. Biochar has emerged as a solution to unsustainable agriculture, environmental degradation, and food insecurity.