What are the best tactics and advice for a beginner

Play slowly: take time to think.
15|10 is the best time control.
Always blunder check before you move.
Whenever you lose a game, analyse it to learn from your mistakes.

Improving Your Chess - Resources for Beginners and Beyond.....
https://www.chess.com/blog/RussBell/improving-your-chess-resources-for-beginners-and-beyond

Basic Tactics are all the same. Pins, forks, skewers, deflection, or removing the guard. What changes is the piece placement in a given position and identifying the Tactics. At higher levels they become more complex because they are used in combination.
Advice: king safety, development of pieces to squares that actually do something in the position, and making sure all the pieces protect each other.

I like to use the words "Ideas and opportunities" rather than "positional and tactical". To me the words "ideas and opportunities" creates a closer tie between "positional play" and "tactical play"; tactics are the opportunities that arise from creating good positions, which arise from the ideas behind your moves.
On one level, though, for starting out, tactics are as chessterd5 mentioned in post #5. I would include "sacrifices" as well, recognizing when sacrificing a pawn, the exchange, or a piece is just worth it (usually because either you gain such a potent attack the opponent has to give the material back, and more, or because it leads to a mating sequence.
Learn a few positional ideas and work out what sort of opportunities those ideas create for you. You have to know when to strike, but to be able to strike you also have to have got yourself to a sound position. So look for outpost square to put your knights. You might not see an immediate benefit (there's no immediate tactic available), but if you get your Knights to good squares, that's what creates tactical opportunities later. If you have lost your light squared Bishop, then get your pawns on light squares. Does your opponent have lots of pawns on dark squares? Then try to trade off their light squared bishop! If you can create these sorts of general advantages, then you will reach the point in the game where those ideas result in tactical opportunities (like the ability to pin, fork, etc).
Positional and tactical play go hand in hand. But to get to the tactical, you have to get the position that allows it.
On a more practical level, the best thing to do is play slow games. You need to study the positions to find the best moves, and to remember your thinking as to why (meaning, to learn). Play slowly at first, later, you will have gained enough experience to play faster versions of chess, but when starting out, you really shouldn't play anything fast other than for fun (meaning, don't expect to learn much from fast games).

The Best Advice I can give to a Beginner is “SAVE” your games.
1 day, you might be ranked 2,000.
You might go to forum to help other Beginners.
And a Beginner on that forum might say “You don’t know what it is like to be ranked 1,000. Your just 2,000. You don’t know the struggles.”
Than you will tell them - Dude, I started off at like 500.
It was a humble beginning which I worked my way up.
And than they will see prove it! Show your games.
If you didn’t save, you will have nothing to show.

1) Discover the joy of protecting your own pieces!
2) Fall in love with safe squares!
3) If your opponent is on one of your safe squares take them!
4) If one of your squares becomes unsafe then > 1) or 2)
Start by learning the rules and practicing basic tactics. Control the center, protect your king, and develop your pieces. Avoid silly mistakes and blunders. Play regularly, analyze your games, and study openings. Don't stress about memorizing everything, focus on understanding concepts and enjoying the game. Learn from your losses and stay patient; improvement takes time. Watch games of top players for inspiration. Most importantly, have fun with it! Chess is a journey, so enjoy the process of learning and getting better.
1) Experiment with different openings to find what suits your style.
2) Don't be afraid to try unconventional moves; sometimes they work!
3) Pay attention to your opponent's moves; it can give you clues about their strategy.
4) Practice patience; rushing can lead to mistakes.
5) Don't get discouraged by losses; learn from them instead.
6) Play against stronger opponents to challenge yourself and learn new strategies.

Take your time to consider your moves and anticipate your opponent's responses. Be cautious of leaving pieces undefended or hanging them to enemy threats.

Chess is a complex game.
That is a reality of the game.
And its meant to be.
And probably is still the most popular indoor game of all time. Worldwide.
To get into the game - consider breaking it down into its elements.
Not in a narrow pigeon-holing way though.
You hear the terms opening - middlegame - endgame - but they're only terms.
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Regarding how to go at the game or how to 'best' go at it -
that could depend on the temperament and individual nature of the person involved.
Like other individual sports like tennis and golf - chessplayers including beginners supervise their own approach to the game.
Which is part of the joy of the game and other individual games.
You're the boss of your chess!
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So - you decide - do you want to organize the elements of the game with the idea of cutting down on the complexity even though that won't get rid of that complexity and shouldn't? (otherwise there'd be no game)
or do you prefer - 'no classifying'?
It would be hard to verbally discuss the game without some classifications.
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Biggest stumbling block by far for chess beginners: Openings. Causes a massive investment of time at the expense of other chess development.
Single most valuable investment: Understanding why a sixth rank King + pawn ends and wins the game against a lone King - even without the 'opposition'.
That's 'money in the bank' chess-wise.
Impacts all other phases of chess-learning - beneficially.

Make all your moves count, try to get pieces off the board & keep the king safe. 🙂♟️
Their pieces, not yours.

Regarding the forum subject ...
'tactics' was included in the subject topic.
Which is good because tactics are so key.
Regarding 'advice' well there's also Suggestions.
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Suggestion: players might try to tell you that observation and calculation are the same thing in chess.
That's wrong because they're very different.
Observation is looking at What's Going On in the position in front of you and in future positions you're considering.
Calculation is something different.
Calculation is comparing carefully prepared sequences of moves in order to select the move to be played.
But before that decision is executed there's also Selection of calculations to be done too. Is done. Constantly. In the middle of the process. Part of it.
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Suggestion: Mistakes are the soul of chess.
A chess game can't be won unless somebody makes at least one mistake.
A Mistake or mistakes big enough to lose the game.
On the board or on the clock.
What's the biggest thing causing Mistakes?
Positions mislead.