To add to that, his Georgia indictment is related to his attempt to convince the Georgia Secretary of State to "find" 11,780 votes for Trump, i.e. exactly one more than needed to turn Georgia into a Trump win. Compelling an election official to lie to overturn an election and disenfranchises voters.
His other indictments include the case in New York about falsification of business documents. In order to reimburse his lawyer, Michael Cohen, for the hush money Cohen had paid on Trump's instruction to Stormy Daniels in order to keep her quiet about their sexual encounter before the 2016 election, Trump billed those reimbursement payments to Cohen as legal fees to the business. Essentially he embezzled from the company. "Allegedly".
The other two cases are federal charges related to his intentional incitement of/ complicity to the insurrection attempts on January 6th, 2021 in order to overturn the election he lost, and the illegal mishandling and possession of classified documents he took from the white house and hid away at his Mar-a-lago resort and then repeatedly lied to the feds about and tried to hide from them. Most recently, he's had charges added to his classified documents case for ordering the destruction of evidence related to the case, specifically he asked an employee to destroy surveillance footage that was evidence to this case.