Noob question- I’ll buy a cup of coffee for someone who can answer. What is the best thinkpad for someone looking to maximize storage?

So, I am clueless about how computers work. But I have a neighbor who is a boomer, and is even more clueless.

She is involved in some court dealings, and needs a new computer. It doesn’t need to be fancy- but she does need it to be relatively fast, and have the option for a lot of storage space to download documents, a lot of applications, and occasionally pictures and videos.

I have no idea how SSDs or HDDs or anything works. All I know is that she needs to have the option to get more storage if needed- whether that’s through an option to upgrade the internal storage quite a bit, or through external storage that ideally can also run software.

Best bang for her buck would also be ideal. Thinking $450 or less. Especially if she’ll need to purchase something else down the line for storage.

Thank you!