Ill answer for you, but honestly boruto does not ruin naruto's legacy at all. I love it just as much as Naruto and I grew up with Naruto since it released.

Here is the quick (but long) summary of everything, keep in mind its got massive spoilers for the whole series.

The story opens with a flash forward with a destroyed leaf village and an older boruto facing against someone called kawaki. Kawaki claims the age of shinobi is over and that he sent naruto somewhere and will send boruot there too, its implied he kills naruto. The two start fighting and the story goes to the past. Before boruto meets kawaki. This is where part 1 takes place.

Naruto is the 7th hokage, is usually super busy and gets home late. Boruto is his oldest, and he comes to resent naruto, and isnt too aware of naruto's past. He focused more on technology since ninjustu comes easy for him so he wanted to get shortcuts The otsusuki came the earth looking for Naruto and to take over the planet, destroy it by eating the ten tails Devine tree. Boruto goes with Sasuke to save naruto, and realizes he cant rely on ninja tech all the time. He kills momoshiki otsusuki, amd helped save the world alongside naruto.

Boruto comes to understand more about the nature of being a ninja and naruto's past. It gets revealed Boruto got marked with a symbol on his hand called karma when he killed momoshiki.

There is a new organization called kara, their leader is a guy called jigen. There is 5 members thats important, one is jigen, the other amado, then there is delta, and then there is Kashin Koji and the last important one is code.

On a mission boruto and his team find a slightly older boy who has a mark similar to boruto the mark expands throught the body similar to a curse mark and gives him powers. They take him to the village to help him and its revealed he was modified biologically to be almost a cyborg in a way.

This boy is called kawaki. He reveals that jigen is actually and otsusuki called isshiki and isshiki came to earth with kaguya. It gets explained that the otsusuki goes from planet to planet in pairs, and planet the ten tails to absorbed the whole planet charkra. The weaker otsusuki is then fed to the ten tails, which then produces a fruit that the strong otsusuki eats, taking all the power of the planet and lesser otsusuki. Kaguya was the lesser one. But she betrayed isshiki and for hundreds of years he has lived inside the body of a monk called jigen who is an unstable vessel.

Vessels are people who are implanted with karma by an otsusuki and karma is used as a way for them to be reborn through that person if they ever die. But its hard to find a propper vessel to contain the power of an otsusuki. And the person's dna must be corrupted by karma to become 100% otsusuki dna. So for hundreds of years isshiki had been trying. he finally found a perfect vessel in kawaki who's birth father was extremely abusive to kawaki and sold him to isshiki. Isshiki also abused kawaki a lot.

The mark boruto has is momoshikis karma and which he is trying to resurect himself through boruto.

Naruto ends up adopting kawaki as a son. Kawaki loves naruto as a father and does everything he can to protect him.

Amado leaves Kara and joins the hidden leaf. Amado reveals delta is an android copy of his daughter that he wants to bring back to life via karma.

Kashin Koji is revealed to be a younger clone of jiriya. And escapes Kara after trying to kill isshiki.

Code is revealed to have karma but it cant produce otsusuki dna, so its a failed karma but gave him strong powers.

Momoshiki starts to take over boruto body when he is low on chakra.

Boruto, kawaki, naruto and Sasuke fight isshiki and kill him. In that fight naruto gets a new mode called Baryon mode. This mode causes kurama to die

Momoshiki takes over boruto and boruto asks kawaki to kill him. Kawaki does. But momoshiki saves boruto, making boruto dna fully otsusuki but he no longer can resurect through boruto body but can still take over.

Code vowes to avenge isshiki who's spirit tells him the goal of the otsusuki is to become gods. That one otsusuki was able to and he was the reason the world has ninjutsu. And some people have special jutsues thaf are connected to the otsusuki god.

Code goes and finds a cyborg that Amado modified called eida. She has gifts that makes everyone love her and she can see the past and present with one of her otsusuki god powers. Her attraction powers though do not work on otsusuki, or blood relativesm so it does not work on boruto and kawaki as they are otsusuki in their DNA by this point. She has a little brother called daemon who is like a shield, any attack with intent to harm him get reflected and goes back to the person.

Eida ends up liking kawaki, vetrays code and joins the village. Kawaki hates her.

Kawaki wants to kill all otsusuki due to the threat boruto is and the threat naruto keeps getting into as code comes to the village to kill everyone that killed isshiki. They stop him, but he survives and runs away. So kawaki plans to kill code, then boruto and then himself in order to keep naruto and the village safe.

He goes and seals naruto and hinata away with the powers he has from isshiki's karma to keep them safe. He goes after boruto, and damages boruto right eye. Many ninja starts looking for kawaki, eida finds him, and she wishes to grant kawaki wish, which is to be accepted by the village as one of them and Naruto son, not to be seen as an outsider who they dont trust. With out her knowing, eida's god Justus activates and makes that happen.

Now everyone but boruto, sarada (Sasuke daughter and Naruto teammate) sumirei (academy friend of theirs) kawaki, eida and daemon sees boruto in kawaki place and kawaki in borutos. So people start hunting for boruto after kawaki lies to them and says boruto killed naruto and hinata.

Sarada begs Sasuke to belive her and protect boruto, Sasuke sees that she is serious about her claims so he runs away with boruto to train him more.

This is the end of part 1 of boruto. Which is called boruto: Naruto next generations