The most basic method used in nearly every sewing project.
These are methods for woven fabrics.

There are plain/open seams – these seams leave fabric edges which need to be finished (protected from fraying) using a separate process.
And ‘finished’ or ‘self-enclosed’ seams – in which the fabric edges are enclosed as part of the seam-making process.

Hand sewn seam – video from Bernadette Banner.
Until about a century ago, all clothes were made this way, and couture ones still are (celebrate that modern sewists have the time to do this to high quality).

All the following links are to written tutorials with photos.

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Machine sewn plain/open seams :
Sewing an open (plain) seam.
Pressing an open seam.

Plain seam finishes :
Many options in this post from SewGuide.
Getting a better zigzag seam finish.
Examples of serged seam finishes from sdBev (wrong side of seam shown left, right side of seam at right).
Hong Kong and bias bound seams, from Closet Core patterns.

Plain seams joining two edges which are :
different lengths – see Halving and quartering.
different shapes – see Princess seams.

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Both open and enclosed or self-finished seams :

These general posts include both ‘open’ and ‘enclosed’ seam finishes :
Grainline Studio on seam finishes.
In the Folds Seam Finishes, also includes hem and facing edges.
Five seam finishing techniques (Sew Essential)
20 different seams from Sew Guide.

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Some individual tutorials on ‘enclosed’ or ‘self-finished’ seams :
Flat fell seam without a special folding foot, from Sew Me Something patterns.
Flat fell seam ending in a seam split, from Carolyn.
A welt seam is like a less bulky flat felled seam, as it only has one side tucked in. So it is only partially enclosed.
French seam, curved french seam, mock french seam.

Converting a pattern to overlapped seams in boiled wool, fleece – pdf (not free) from Cutting Line Designs.

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First published July 2020, links checked October 2022

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