Of you're looking for a good laptop to tinker with, have a look at this:

https://www.ebay.com/itm/357266509354?_skw=t580+refurb+i7&itmmeta=01K076Q3YRQ9SJD7JZ5QQAWDFZ&hash=item532ebe4e2a:g:oN4AAeSwFMNocBoL&itmprp=enc%3AAQAKAAAA8FkggFvd1GGDu0w3yXCmi1eqbsXIk5orK25RDCbSJXDrf9RZ%2B5toN7RyBEtYIoFyvvbOiQZ3SXjOXvSPSUW9AXIMOsOYysJ9qRhbVEkPeKqRNNFCOm18kqlYqP%2FG8HbBP%2BaH2YWCHGWB1ffKqlcwOgQCM02foUdy8hYUOO7wWg%2BN%2FqEzQh46lkqwdCXcfaMT3L3erYmgplFZ4fFJkx3AoRClJ8szAc1J2H8sDnCJDDMJnt4hAMUxj4amz%2FONNDeYVLZHv3ULckxXkgxx8Vuhsq3JQeaIk%2BmK5NOM0LAVcMzjlGyuWym1ezWuwxp1c6u6Ww%3D%3D%7Ctkp%3ABk9SR76_3OaBZg

These are the last great Thinkpads, IMO. Not as modular as previous generations but new enough to have better screens, WiFi, USB-C, and still fantastic keyboards. You can add in an extra drive, way more RAM, and even a much better screen (though the normal non-touch screen is decent enough for my purposes), and still has two batteries with one being easily swapable.

Want a sleeker package with less modularity? The 490/590 are a better deal, usually.