Avoiding alcohol is the common recommendation. The way hep A works in the body is not well understood. Virtually all people get better on their own. You can only get it once. It is transmitted by infected blood and body fluids including semen, vaginal secretions and saliva.
Sexual contact is the most common means of transmission.
Some people with HBV have no outward signs or symptoms. Treatment that is typically recommended is a manufactured form of interferon. HBV infects liver cells, causing swelling and the tissue to die. Your own immune system response causes some of the symptoms associated with HBV infection. A vaccine is available.