Short answers, pulled from the story.
Alexis of Russia, also known as Alexei Mikhailovich, was the second tsar from the House of Romanov. He reigned as Tsar of all Russia from 1645 until his death on the 8th of February 1676. At the time of his death, Russia spanned almost 8.1 million square kilometers.
The Sobornoye Ulozheniye was a new legal code issued by Alexis in 1649. It made him the first tsar to sign laws on his own authority and strengthened the bonds between autocratic power and the lower nobility. The code was partly a response to popular discontent shown by the Salt Riot of 1648.
The Salt Riot broke out in May 1648 when Muscovites rose against the faction of Boris Morozov, Alexis's tutor and chief minister. Morozov had tripled the tax burden and was accused of corruption and sorcery. Alexis was forced to dismiss and exile Morozov to the Kirillo-Belozersky Monastery.
The Truce of Andrusovo, signed on the 11th of February 1667, ended Russia's war with Poland. Under its terms, Russia kept Smolensk and Kiev along with the entire eastern bank of the Dnieper river. It was negotiated by Afanasy Ordin-Nashchokin, described as the first Russian chancellor and diplomat in the modern sense.
In 1653, Patriarch Nikon introduced reforms to align Russian Orthodox practice with Greek Orthodoxy, including mandating the sign of the cross with three fingers instead of two. Those who refused were excommunicated by the Great Moscow Synod of 1666 and formed the Old Believers movement. Persecution followed, and some Old Believers took refuge in the Solovetsky Monastery, which was besieged for seven years before falling on the 22nd of January 1676.
Yes. After his first wife Maria Miloslavskaya died, Alexis remarried on the 1st of February 1671 to Natalya Kirillovna Naryshkina. Their son Peter, born in 1672, became Tsar and the first Emperor of Russia, known as Peter the Great. Alexis also fathered Ivan V and Sofia Alexeevna, who served as regent of Russia from 1682 to 1689, from his first marriage.