Tables
For simple tables I use LaTable
LaTable is an editor that allows you to create and save tables in its own format. Each time you create or load a LaTable file the application writes the corresponding LaTeX code which you can copy-paste in to your document. Simple but effective.
https://www.ctan.org/pkg/latable
One approach to well behaved tables
This is covered in one of my 'minimal examples' which you can download from this site. I use the following macro to solve most of my table problems.