3 C are single bond to each other. The left-most C is single bond to 3 H. The middle C is single bond to 1 H and one single bond is to OH with two lone pair on O. The right-most C has a double bond with 1 O which has two lone pair and 1 single bond to another O which also has 2 lone pair. This single bond O has a single bond with a H. Hope that all make sense.
There are sigma bond and 1 pi bond.
There are sigma bond and 1 pi bond.