An easy way to prove the proof by direct proving is
1. states the given and reason it out as given
2. then you start the basic statement and reason.
3. you can support you answer by the postulate,definition and theorem .
4.just make it step by step.
like for example;
Given : AB ≈ BF , AC ≈CF
Prove : ΔABC ≈ Δ BCF
                   STATEMENT                                     REASON
1.AB ≈BF                                                      GIVEN
2.AC≈CF                                                       GIVEN
3.BC≈CB                                                       REFLEXIVE PROPERTY OF EQUALITY
4.ΔABC≈ΔBCF                                              BY SSS POSTULATE
                                                                    Therefore proven.