How to find birth/marriage/baptism/death records
What 'Countries'? ... (ie. 'Place(s)')
What 'Dates' ... (ie. Time period)
What exactly are you searching for?
Who exactly are you searching for?
You need to provide as much 'Detail' as possible, for people to be able to help/assist you.
For many places in the world you can begin with the Guided Research. An example for Mexico is at https://www.familysearch.org/wiki/en/GuidedResearch:Mexico, for New York is at https://www.familysearch.org/wiki/en/GuidedResearch:New_York, and for Hampshire, England, is at https://www.familysearch.org/wiki/en/GuidedResearch:Hampshire.
The guided research (if available) for those locations that you are interested in is at the top of the sidebar on the location's Wiki page.
Barbados about 1870 baptism marriage or death records for:
George Patrick and wife Marrion Skeete
Ah ... Barbados ...
Here are a few places to start ...
The "Catalogue" in 'FamilySearch' ... some 96 results ...
The 'Wiki' in 'FamilySearch' ...
Barbados Archives and Libraries
Give them a go ...
I hope this helps.