any other form of upgrade on a laptop is to be considered a No No
Yes- hard drives can be replaced but within limits.
Even the memory may not be able to be 'upped' as much as you would like.
If you are dedicated hobbyist and want to go deep- no harm in trying.
But for yer average user leave well alone.
These things are designed and built as integrated units- 'No user serviceable parts inside'- is a good epithet
Go to W H Smith on a Thursday and purchase a copy of MicroMart- that has all the lowdown and suppliers.