Short Answer 
The events of January 6, 2021, began with Congress certifying Joe Biden’s election win amid claims of fraud from Trump and his supporters. As these supporters protested, a breach of the U.S. Capitol ensued, leading to Trump’s impeachment for inciting the insurrection, marking a historic political moment.
Step 1: Certification of Election Results
On January 6, 2021, Congress convened to officially certify the election results showing that Joe Biden won the presidency. This process is a constitutional requirement where electoral votes are counted and confirmed by Congress. However, this event was marked by significant controversy as Trump and his supporters asserted that the election was marred by fraud.
Step 2: Protest and Breach of the Capitol
As Congress was certifying the results, thousands of Trump supporters gathered to protest the certification. Tensions escalated, leading to a chaotic breach of the U.S. Capitol building itself. This unprecedented event highlighted deep political divisions and raised concerns over the security and integrity of democratic institutions.
Step 3: Impeachment of Trump
In the aftermath of the events on January 6, the House of Representatives took decisive action by impeaching Donald Trump on January 13, 2021. He was charged for inciting the insurrection, reflecting the gravity of his involvement in encouraging the protest. This marked the second impeachment of Trump, underscoring the significant constitutional and political ramifications of the Capitol breach.