Verb conjugation of "reconstruir" in Spanish

The connecting flight to Phuket was fully booked, and the connection to Krabi had five empty seats. The problem was that the boarding began in ten minutes and I did not even have a ticket.
I have even met someone who invited me to come and visit. It was an older couple who were renting apartments for language students. Well, actually there are agencies that offer the same as this couple, but I'm open.
Now I am learning by other means, such as reading and writing. I can not begin with conjugation training because I lack the basic knowledge. How are you learning at this site and which is your best lesson?