Reading AWR Reports

We are facing the problem of slow performance in the production system and lots of complaints from the clients for resource busy or system hang related issue. We are finding the locked object in the system which are mostly inactive in nature so we kill them manually and the problem gets resolve.

We have some observation in AWR reports which are as below :

1)
Instance Efficiency Percentages (Target 100%)
Execute to Parse %: -26.96
Parse CPU to Parse Elapsd %: 4.83
===============================================================
2) Total time in database user-calls (DB Time): 55700.6s
=================================================================
3)
TCP_RECEIVE_SIZE_DEFAULT 16,384
TCP_RECEIVE_SIZE_MAX 9,223,372,036,854,775,807
TCP_RECEIVE_SIZE_MIN 4,096
TCP_SEND_SIZE_DEFAULT 16,384
TCP_SEND_SIZE_MAX 9,223,372,036,854,775,807
TCP_SEND_SIZE_MIN 4,096
=================================================================
4)
Wait Class Waits %Time -outs Total Wait Time (s) Avg wait (ms) %DB time
Network 45,423,119 0 2,122 0 3.81
=================================================================
5)
Event Waits %Time -outs Total Wait Time (s) Avg wait (ms) Waits /txn % DB time
SQL*Net message to client 45,030,511 0 55 0 127.77 0.10
=====================================================================

The Top Five events are :

db file sequenctial Read
enq TX -row lock contention
DB CPU
Virtual circuit wait
Read by other session

Is there a any oracle doc id or any other document ,which can be referred to get better understanding of AWR Reports and gives the steps of resolution to be taken for various top timed events