Here, a "services portfolio" is the set of services that one can perform well, the same as the set of services that one can offer in exchange for money. Having a "diversified services portfolio" means that one is able to offer a variety of services of various kinds: fixing servers, writing SQL queries, auditing firewall rules, and so on. "Being more agile in an ever-shifting economy" means that if one loses work one place, one can find work elsewhere (maybe work of a different kind -- hence being able to offer more than one skill).
portfolio usually means either a collection of your works or a collection of things that show what you can do 4 an artist portfolio would be a collection of small works that show their art style or a digital version that shows many of their works
For a programmer a programmer's portfolio would be a link to any open source software that they created and/or the names of commercial products that they work done may be linked to them and some pictures
Basically it's a thing to show what you can do so someone who wants to hire you can decide if they like your work
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