Disclaimer: I must let you know that HP does not recommend upgrades or hardware changes as the device is equipped with parts that perform at its optimal performance by design, that said, the upgradeable parts listed by HP articles are purely for your ease, as the decision to upgrade will be at your own discretion.
The above link will have the details on all your queries, I recommend keyword searches such as "Storage" for SSD upgrades, RAM/Memory or Graphics for GPU upgrade options tested to work on your device, by HP.
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