Isaak,

@drasvi nouns according to wiktionaries model have a stem and an ending.

Example:

фрукт

stem-фрукт

ending - none for masculine nominative singular

but in other cases

фрукт

фруктЫ - ending = ы

фруктА - ending = а

фруктОВ - ending = ов

фруктУ - ending = у

etc.

The table shows the endings per different noun types.

1st table is masculine nouns and their endings change per case (падеж).

The vertical columns are written by noun type

The horizontals are written by case type

@Natalia In wiktionary masculine nouns ending in -а are written as feminine-form, this table is based of wiktionary

@drasvi yes there is at the moment no detailed conjugation of nouns on the internet listed like this. I created this using wiktionaries categories mostly, but wiktionary doesn't have them categorized really.. but it has categories. There is no table or page explaining the rules of conjugations so I had to search these up myself

In the masculine part you don't have nouns ending in а/я (папа, дядя, Вася, Саша)

They'll change as fem. nouns

And I'd advise looking up pl. gen and words with ц-stem in the dictionary. They may be tricky)