You can start with exercises with your own weight: push-ups, squats, holding the plank. Such exercises strengthen the main muscle group and gradually prepare the body to work with weights. The key is to perform the movements correctly to avoid injury.
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If you have access to a gym, start with light weights. Be sure to maintain a balance between training all muscle groups to avoid asymmetry. Recovery, nutrition, and sleep also play an important role in the results of strength training.