What are some exercises I can use to train my biceps at home?
There are many exercises you can do at home to train your biceps. Here are a few examples:

Push-ups: While push-ups primarily target your chest, they also engage your biceps as a secondary muscle group. To target your biceps more directly, you can try doing diamond push-ups, where you place your hands close together to form a diamond shape.

Dumbbell curls: This classic bicep exercise can be done with dumbbells or any weighted object you have at home. Stand with your feet shoulder-width apart and hold the weights at arm's length with your palms facing forward. Slowly bend your elbows and lift the weights towards your shoulders, then slowly lower them back down.

Resistance band curls: If you don't have dumbbells, you can use resistance bands to do bicep curls. Stand on the center of the band with your feet shoulder-width apart and hold the handles with your palms facing forward. Slowly bend your elbows and lift the handles towards your shoulders, then slowly lower them back down.

Chin-ups: If you have a chin-up bar at home, you can use it to target your biceps. Grip the bar with your palms facing towards you and your hands shoulder-width apart. Pull yourself up until your chin is above the bar, then slowly lower yourself back down.

Remember to always warm up before exercising and to use proper form to avoid injury.
Thanks. However, I have an injury and cannot do push ups. I also do not have any dumbbells, resistance bands, or a chin-up bar. What other exercises can I do for my biceps?
I'm sorry to hear about your injury and equipment limitations. Here are a few additional exercises you can try that don't require any equipment and are low-impact:

Isometric curls: Stand with your arms by your sides and your palms facing forward. Make a fist and contract your biceps as hard as you can for 10-15 seconds, then release. Repeat for several sets.

Towel curls: Grab a towel or a t-shirt and hold it with both hands, palms facing up. Place your feet hip-width apart and step on the towel with your left foot. Hold the other end of the towel with your right hand and curl it up towards your shoulder, keeping your elbow close to your body. Repeat on the other side.

Doorway curls: Stand facing a doorway and place your hands on either side of the frame, with your palms facing forward. Lean forward slightly and push against the doorway with your arms, engaging your biceps. Hold for a few seconds, then release and repeat.

Bodyweight curls: Sit on the edge of a chair or bench with your feet flat on the ground. Place your hands on the edge of the seat, fingers pointing forward. Slowly lift your body up off the chair, bending your elbows and bringing your body towards the chair. Lower yourself back down and repeat.

Remember to listen to your body and not push yourself too hard, especially if you are dealing with an injury. If any of these exercises cause pain or discomfort, stop immediately and consult with a medical professional.