There are two main types of cells:
Prokaryote and eukaryote
And for Eukaryote there are Animal and Plant cells

They both share: Genes and Ribosomes, reflecting common ancestry

Prokaryote: Do NOT have a nucleus
Has a cell wall
Unicellular ONLY
Has NO membrane organelles

Eukaryote: DOES have a nucleus AKA cooler cells
A few have cell walls, but most have membranes
WAYYYY is more complex, as it has membrane-bound organelles.

Organelles:
The cell has small parts of itself that help it survive and stuff

Cytoplasm:
This is the space inside of the cell that contains all of the organelles AKA Everything inside the cell

Cytosol:
This is the liquid inside the cell where the organelles swim around in

Tissue:
Many cells working together

Homeostasis:
The Cell membrane is vital to cell regulation, so the cell and environment are equal, this is mostly done through Osmosis.

The nucleus stores the DNA.
The nucleus is double-layered, as it has two membranes

Para-nuclear space:
The space between the nucleus’s inner membrane and outer membrane

Nuclear pore:
A tunnel protein that goes through the nucleus’s double lipid membranes.

Ribosomes function: synthesis Proteins from mRNA.

Ribosomes structure:
Some are free-flowing and DO NOT have a membrane.
Rather a Large and a Small Subunit.
They are made out of rRNA (Ribosomal RNA) and some proteins.

Why are cells small:
The bigger the cell the worse.
The Surface Area and Volume ratio get lower and lower, which means that it will take exponentially more time for nutrients to get into the cell, and for waste like CO2 to get out of the cell.
The Longer the radius the lower the SA:V Ratio.

Differences between Plant and Animal Cells: