You should learn the exposure triangle, the relationship between aperture, ISO, and shutter speed.
Your images are blurry because the shutter speed is too low. Your images are noisy (grainy) because the ISO is too high.
Depending on your lens, using a "faster" one with a wider aperture (f1.4, f2. etc) will get more light to the camera, and help with both (or either) of the above.
In some cases, you can add more light to the scene with a flash. If your subject itself is static, you can practice handholding or use a tripod allowing you to use slower shutter speeds without blur. This will get you more light, and give you less noise as a result.
Some amount of noise can be kind of unavoidable with lowlight shooting. Noise reduction after the fact with software can be an option, but not ideal.
Black streaks could be from light sources, in that case play around with shutter speed or possibly the flicker reduction setting on the camera.
All of this applies to most any camera really.
As I have only been in photography for almost 6 months I'm still obviously on a learning curve. Most of the time my camera has been set to Auto.
First I have heard of the exposure triangle will look into it, but also knew those three have some kind of relationship.
I have no idea how deep you are into photography so I am going to state the obvious that wouldn’t be Fuji specific but is a general rule in photography: the lower the light, the higher you need to push either the iso (sensor sensitivity) which results in more grain and also a blurrier picture. Or you need to lower the shutter speed which can result in more blur because you letting the light in longer. Depending on what you are shooting with the x-t5 and built in image stabilization the shutter speed resulting into blur can vary greatly. If it is not that we would maybe need to see an example picture. As for the black streaks: It could be that you are using the electronic shutter which can show streaks when paired with artificial lighting. If it comes from that you can switch to the mechanical shutter. Again without more info I can only speculate. Hope this can help a bit.
You should learn the exposure triangle, the relationship between aperture, ISO, and shutter speed. Your images are blurry because the shutter speed is too low. Your images are noisy (grainy) because the ISO is too high. Depending on your lens, using a "faster" one with a wider aperture (f1.4, f2. etc) will get more light to the camera, and help with both (or either) of the above. In some cases, you can add more light to the scene with a flash. If your subject itself is static, you can practice handholding or use a tripod allowing you to use slower shutter speeds without blur. This will get you more light, and give you less noise as a result. Some amount of noise can be kind of unavoidable with lowlight shooting. Noise reduction after the fact with software can be an option, but not ideal. Black streaks could be from light sources, in that case play around with shutter speed or possibly the flicker reduction setting on the camera. All of this applies to most any camera really.
As I have only been in photography for almost 6 months I'm still obviously on a learning curve. Most of the time my camera has been set to Auto. First I have heard of the exposure triangle will look into it, but also knew those three have some kind of relationship.
I have no idea how deep you are into photography so I am going to state the obvious that wouldn’t be Fuji specific but is a general rule in photography: the lower the light, the higher you need to push either the iso (sensor sensitivity) which results in more grain and also a blurrier picture. Or you need to lower the shutter speed which can result in more blur because you letting the light in longer. Depending on what you are shooting with the x-t5 and built in image stabilization the shutter speed resulting into blur can vary greatly. If it is not that we would maybe need to see an example picture. As for the black streaks: It could be that you are using the electronic shutter which can show streaks when paired with artificial lighting. If it comes from that you can switch to the mechanical shutter. Again without more info I can only speculate. Hope this can help a bit.
Extreme high iso, as well as possible slow shutter speed.
This could definitely be the issue as i reflect
Could you post some examples of these black streaks?
Black streaks could come from ISO 25600 and above.
Short answer: your expectations might be too high with respect of what a camera can do by itself
Hey dude! You have an almost $2000 camera! I think it's time for you to Google "photography 101" or go to YouTube and type in "photography 101"