Renko chart makes identification of key support/resistance easier. Moreover one easily sees that they tightly fit with Fibo levels. We are currently in a downtrend towards the main year support which was tested in spring and in fall. An investor may be interested to enter at the 97 area, this would be a fair price for a stock whose average target price is 128.3 (tipranks.com) and rated as "strong buy". I don't own this stock currently, I'm long CELG but I consider buying GILD someday.