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(2a)Follow up to the time where he eventually leads to from the second time event which is when Doc gets shot
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(3)After messing up many things in the past he manages to fix them and with Doc's help eventually goes back to his "present" time knowing that Doc is going to die, he prevents it from happening in the first place. Marty sets the time to 10 minutes before the terrorists arrive and leaves to the "present" time
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(1)Einstein, Doc's dog is sent back 1minute into the future using Doc's time machine as a test subject.
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(2)Marty chooses to sit in the time travelling car to run away from the terrorist at this time, he eventually ends up hitting the 88mph mark which the Doc said activates the ability to timetravel, with this Marty lands up in 1955.
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(4) Marty fixes many things and comes back to the future changing his parents from being unsuccessful to succesful, along with changing his dad from a nerd to a casual person and changing his mom from an alcoholic to sober person.
