Update: this book doesn't spoil the Civil war event (as far as i know [ill update later if i'm wrong, after reading it]), but the Heroes for Hire story does spoil a big moment for spider-man seen at the start of the Civil War reading order.
Currenty, this is the only Marvel Civil War trade paperback i own. These stories are okay. 2 or 3 stars, maybe others may rate this book more harshly. I don't know how necessary of reads these issues are if you're reading through Marvel's Civil war. the Thunderbolts Issues are better is you are Familiar with Zemo an Capt America's pior engagements. If you know that captain America gets arrested later by Iron Man, then the Thunderbolts issues are a kinda necessary read. if you want skip these issues just know Zemo helps Capt escape.
the Hero's for hire issues are about Iron man having the hereos for hire arrest bad guys (the same with the thunderbolts). I like issue #3. Iron Man wants Heroes for Hire to arrest Captain America, but shenanigans occur. the rest of the story is a skrull organ factory. Ricadonna appears (from daughters of the Dragon 2006 [first appearance]) It not a necessary read for these civil war issues, but it couldn't hurt. after this, the character never appears in comics until Miles Morales: spider-men #15 (2022). i doubt it concludes the vendetta Tarantula (first appearance) has her. if skrull harvesting and Captain America getting a new hideout is relevant in the Marvel Civil War event, then these issues are more o a must read. if not these are an okay story. if you really wanted to know how Misty Knight feels about Iron Man and Captain America fued. this is the story for you, but (because of the writing) it's not that deep. Update: only the first 3 issues of HFH are civil war so I suppose the skrull segement is not relevant.
to sumarize: Thunderbolts and Heroes For Hire is about Iron Man elistin in these teams to arrest villians. one team is of villians and the other has villians on the team. both teams interact with Captain America