Question: I do not understand ocelot plan during the games. nor that of solidus. can you help?

[ahln1239]

Ocelot's motivations are complicated. Also, I don't think Kojima had his entire motivations mapped out from the start of the series.

The Patriots weren't a fully united front since the Les Enfantes project cloned Big Boss. They split into Big Boss's faction (himself, Ocelot, and EVA) and Zero's faction (Zero, Sigint, and Paramedic). Oceloet remained loyal to Big Boss's side of the Patriots. He thought he could use Solidus to get closer to the Patriots so he went along with Solidus's plan to engineer the Shadow Moses incident in MGS1. Solidus wanted REX to use against the Patriots but it was destroyed and his Sec of Defense was working with the Patriots to neutralize everything.

Solidus also believed the Patriots were 12 people instead of AIs. Ocelot hoped Solidus would expose the S3 plan and the AI patriots. His goal was to eliminate Zero's branch and the AIs that Sigint had created.

From what I understood from the wiki (as much as it is possible to understand it), Ames helped stop the Secretary of Defense because the Patriots did not like the idea of the Secretary blowing the place up. If that happened, they would not be able to cover up the Metal Gear incident properly. Therefore, when Campbell contacted Solidus and asked him to stop the Secretary of Defense, he probably agreed reluctantly because that was also what the Patriots wanted.
After that, Ocelot — who had helped Solidus during the events of the first game, probably as part of his efforts to bring down the Patriots — seemingly agreed to cooperate with the Patriots again and use Solidus for their S3 Plan. Because of this, they allowed him to do what Solidus wanted as well, which was spreading Metal Gear technology onto the black market so they could generate enough money to finance the S3 Plan.
What feels strange is that Ocelot agreed to this and helped them during the events of Metal Gear Solid 2: Sons of Liberty. According to the wiki, the money generated from selling Metal Gear information on the black market was later used for the Patriots’ S3 project.