What are the 3 evo processes that cause evolution? how do they oppose each other

Evolution can be defined as change in allele frequencies over time.
Name three evolutionary processes that can cause evolution in this sense and describe how they do so.
Natural selection
Genetic drift
Gene flow
Mutation
Genetic hitchhiking

Describe how two of those processes might act in opposition to each other.
Lets choose 2 processes-Gene flow & Mutation.
Mutation introduce new alleles which cause new characters introduced in population leading to natural selection or extinction while gene flow unfavors evolution as random mating occurs and gene frequency remain same.
What is the likely evolutionary outcome of that opposition?
In gene flow gene frequency remain same leading to no evolution while in mutation it cause evolution.