Pay attention to the personal quests of the characters (in the list of quests), the fortune teller helps with them. Relationship-related goods are sold by L. If you don't know who they are, then ask the bartender in the Tavern if there are rumors in the town. This will help move along the plot and open the two mentioned if you haven't found them in the plot.
In essence, this game is not very difficult. It is only important to remember the names of the key characters and, if necessary, use the game's hints. Also, the library contains a description of all the main mechanics and hints for beginners.